Update README.md
Merge pull request #128 from Sebstefanov/patch-3

Update README.md
Added missing changelog entry.
JSHint and JSCS fixes for htmlparser tests.
API Docs: Setting Configuration guide mentioned in config.js.
API Docs: config.contentsLanguage.
JSCS and JSHint fixes in widget and font plugins.
Added image optimizer.
Renamed grunt task name to 'images'.
Covered more images with the grunt task and made JSHint accept the grunt file.
Optimised images.
Changelog entry.
Merge branch 't/12338'
Merge branch 'master' into major