create changelog

CHANGELOG.md

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+# 0.8.3
+
+This release is largely focused on performance and robustness
+ - implement smallint optimization for numbers, making some benchmarks 50% faster
+ - remove `bimap` as a dependency for storing named colors in favor of an ad hoc, more specialized data structure
+ - remove *dozens* of panics on malformed input
+ - use `beef::Cow` instead of `std::borrow::Cow`
+ - increase code coverage to 80%
+
+
+# 0.8.2
+
+This release contains significant (>10x) improvements for WASM speed.
+Performance is now comparable to libsass bindings with `node-sass` as
+well as `dart-sass` with dart2js. It is, however, roughly 4x slower than
+native `grass`.