Revert back to the standard library hashmap

Related to #34

CHANGELOG.md

@@ -3,6 +3,11 @@ This project attempts to adhere to [Semantic Versioning](http://semver.org).
 
 ## [Unreleased]
 
+### Changed
+
+- Revert back to the standard library hashmap because it will use hashbrown very
+  soon
+
 ## [0.9.1] - (2019-04-08)
 
 ### Changed

Cargo.toml

@@ -15,7 +15,6 @@ documentation = "https://docs.rs/strsim/"
 exclude = ["/.travis.yml", "/dev"]
 
 [dependencies]
-hashbrown = "0.1.8"
 ndarray = "0.12.1"
 
 [badges]

src/lib.rs

@@ -1,16 +1,15 @@
 //! This library implements string similarity metrics.
 
-extern crate hashbrown;
 extern crate ndarray;
 
 use std::char;
 use std::cmp::{max, min};
+use std::collections::HashMap;
 use std::error::Error;
 use std::fmt::{self, Display, Formatter};
 use std::hash::Hash;
 use std::str::Chars;
 
-use hashbrown::HashMap;
 use ndarray::Array2;
 
 #[derive(Debug, PartialEq)]