chore: Add webpack notes to Changelog

BREAKING CHANGE: Replace browserify with webpack as it didn't support requires properly. The setup got a bit simpler.

Changelog.md

@@ -1,8 +1,13 @@
-# v.1.2.0
+# v2.0.0
+- Migrate build system to webpack
+- Remove `srcissors.min.js` and source files from the npm package
+  `srcissors.js` should now directly work with all bundlers, previously the setup was somewhat broken.
+
+# v1.2.0
 
 - Add `showSurroundingImage` and `surroundingImageOpacity` options [#9](https://github.com/livingdocsIO/srcissors/pull/9)
 
-# v.1.1.0
+# v1.1.0
 
 - Add a `minResolution` parameter [#6](https://github.com/livingdocsIO/srcissors/pull/6)