docs: Update changelog for 0.2.3

Author: joshwiens

CHANGELOG.md

@@ -6,6 +6,11 @@ All notable changes to this project will be documented in this file. See [standa
 ## [0.2.3](https://github.com/webpack/source-map-loader/compare/v0.2.2...v0.2.3) (2017-10-23)
 
 
+### Chores
+
+* Increase minimum version of source-map dependency for bug fix https://github.com/mozilla/source-map/issues/247 ([#56](https://github.com/webpack-contrib/source-map-loader/issues/56)) ([f6cf53c](https://github.com/webpack/source-map-loader/commit/f6cf53c))
+
+
 
 <a name="0.2.2"></a>
 ## [0.2.2](https://github.com/webpack/source-map-loader/compare/v0.2.1...v0.2.2) (2017-09-30)