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diff --git a/vendor/heck/src/lib.rs b/vendor/heck/src/lib.rs
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index 49bfb0e..0000000
--- a/vendor/heck/src/lib.rs
+++ /dev/null
@@ -1,209 +0,0 @@
-//! **heck** is a case conversion library.
-//!
-//! This library exists to provide case conversion between common cases like
-//! CamelCase and snake_case. It is intended to be unicode aware, internally
-//! consistent, and reasonably well performing.
-//!
-//! ## Definition of a word boundary
-//!
-//! Word boundaries are defined as the "unicode words" defined in the
-//! `unicode_segmentation` library, as well as within those words in this
-//! manner:
-//!
-//! 1. All underscore characters are considered word boundaries.
-//! 2. If an uppercase character is followed by lowercase letters, a word
-//! boundary is considered to be just prior to that uppercase character.
-//! 3. If multiple uppercase characters are consecutive, they are considered to
-//! be within a single word, except that the last will be part of the next word
-//! if it is followed by lowercase characters (see rule 2).
-//!
-//! That is, "HelloWorld" is segmented `Hello|World` whereas "XMLHttpRequest" is
-//! segmented `XML|Http|Request`.
-//!
-//! Characters not within words (such as spaces, punctuations, and underscores)
-//! are not included in the output string except as they are a part of the case
-//! being converted to. Multiple adjacent word boundaries (such as a series of
-//! underscores) are folded into one. ("hello__world" in snake case is therefore
-//! "hello_world", not the exact same string). Leading or trailing word boundary
-//! indicators are dropped, except insofar as CamelCase capitalizes the first
-//! word.
-//!
-//! ### Cases contained in this library:
-//!
-//! 1. UpperCamelCase
-//! 2. lowerCamelCase
-//! 3. snake_case
-//! 4. kebab-case
-//! 5. SHOUTY_SNAKE_CASE
-//! 6. Title Case
-//! 7. SHOUTY-KEBAB-CASE
-//! 8. Train-Case
-#![deny(missing_docs)]
-#![forbid(unsafe_code)]
-
-mod kebab;
-mod lower_camel;
-mod shouty_kebab;
-mod shouty_snake;
-mod snake;
-mod title;
-mod train;
-mod upper_camel;
-
-pub use kebab::{AsKebabCase, ToKebabCase};
-pub use lower_camel::{AsLowerCamelCase, ToLowerCamelCase};
-pub use shouty_kebab::{AsShoutyKebabCase, ToShoutyKebabCase};
-pub use shouty_snake::{
-    AsShoutySnakeCase, AsShoutySnakeCase as AsShoutySnekCase, ToShoutySnakeCase, ToShoutySnekCase,
-};
-pub use snake::{AsSnakeCase, AsSnakeCase as AsSnekCase, ToSnakeCase, ToSnekCase};
-pub use title::{AsTitleCase, ToTitleCase};
-pub use train::{AsTrainCase, ToTrainCase};
-pub use upper_camel::{
-    AsUpperCamelCase, AsUpperCamelCase as AsPascalCase, ToPascalCase, ToUpperCamelCase,
-};
-
-use std::fmt;
-
-#[cfg(feature = "unicode")]
-fn get_iterator(s: &str) -> unicode_segmentation::UnicodeWords {
-    use unicode_segmentation::UnicodeSegmentation;
-    s.unicode_words()
-}
-#[cfg(not(feature = "unicode"))]
-fn get_iterator(s: &str) -> impl Iterator<Item = &str> {
-    s.split(|letter: char| !letter.is_ascii_alphanumeric())
-}
-
-fn transform<F, G>(
-    s: &str,
-    mut with_word: F,
-    mut boundary: G,
-    f: &mut fmt::Formatter,
-) -> fmt::Result
-where
-    F: FnMut(&str, &mut fmt::Formatter) -> fmt::Result,
-    G: FnMut(&mut fmt::Formatter) -> fmt::Result,
-{
-    /// Tracks the current 'mode' of the transformation algorithm as it scans
-    /// the input string.
-    ///
-    /// The mode is a tri-state which tracks the case of the last cased
-    /// character of the current word. If there is no cased character
-    /// (either lowercase or uppercase) since the previous word boundary,
-    /// than the mode is `Boundary`. If the last cased character is lowercase,
-    /// then the mode is `Lowercase`. Othertherwise, the mode is
-    /// `Uppercase`.
-    #[derive(Clone, Copy, PartialEq)]
-    enum WordMode {
-        /// There have been no lowercase or uppercase characters in the current
-        /// word.
-        Boundary,
-        /// The previous cased character in the current word is lowercase.
-        Lowercase,
-        /// The previous cased character in the current word is uppercase.
-        Uppercase,
-    }
-
-    let mut first_word = true;
-
-    for word in get_iterator(s) {
-        let mut char_indices = word.char_indices().peekable();
-        let mut init = 0;
-        let mut mode = WordMode::Boundary;
-
-        while let Some((i, c)) = char_indices.next() {
-            // Skip underscore characters
-            if c == '_' {
-                if init == i {
-                    init += 1;
-                }
-                continue;
-            }
-
-            if let Some(&(next_i, next)) = char_indices.peek() {
-                // The mode including the current character, assuming the
-                // current character does not result in a word boundary.
-                let next_mode = if c.is_lowercase() {
-                    WordMode::Lowercase
-                } else if c.is_uppercase() {
-                    WordMode::Uppercase
-                } else {
-                    mode
-                };
-
-                // Word boundary after if next is underscore or current is
-                // not uppercase and next is uppercase
-                if next == '_' || (next_mode == WordMode::Lowercase && next.is_uppercase()) {
-                    if !first_word {
-                        boundary(f)?;
-                    }
-                    with_word(&word[init..next_i], f)?;
-                    first_word = false;
-                    init = next_i;
-                    mode = WordMode::Boundary;
-
-                // Otherwise if current and previous are uppercase and next
-                // is lowercase, word boundary before
-                } else if mode == WordMode::Uppercase && c.is_uppercase() && next.is_lowercase() {
-                    if !first_word {
-                        boundary(f)?;
-                    } else {
-                        first_word = false;
-                    }
-                    with_word(&word[init..i], f)?;
-                    init = i;
-                    mode = WordMode::Boundary;
-
-                // Otherwise no word boundary, just update the mode
-                } else {
-                    mode = next_mode;
-                }
-            } else {
-                // Collect trailing characters as a word
-                if !first_word {
-                    boundary(f)?;
-                } else {
-                    first_word = false;
-                }
-                with_word(&word[init..], f)?;
-                break;
-            }
-        }
-    }
-
-    Ok(())
-}
-
-fn lowercase(s: &str, f: &mut fmt::Formatter) -> fmt::Result {
-    let mut chars = s.chars().peekable();
-    while let Some(c) = chars.next() {
-        if c == 'Σ' && chars.peek().is_none() {
-            write!(f, "ς")?;
-        } else {
-            write!(f, "{}", c.to_lowercase())?;
-        }
-    }
-
-    Ok(())
-}
-
-fn uppercase(s: &str, f: &mut fmt::Formatter) -> fmt::Result {
-    for c in s.chars() {
-        write!(f, "{}", c.to_uppercase())?;
-    }
-
-    Ok(())
-}
-
-fn capitalize(s: &str, f: &mut fmt::Formatter) -> fmt::Result {
-    let mut char_indices = s.char_indices();
-    if let Some((_, c)) = char_indices.next() {
-        write!(f, "{}", c.to_uppercase())?;
-        if let Some((i, _)) = char_indices.next() {
-            lowercase(&s[i..], f)?;
-        }
-    }
-
-    Ok(())
-}