changelog: isoInstance and license terms

changelog.md

@@ -2,9 +2,11 @@
 
 ## v2.2.0
 
++ Revised license model. Isotope is licensed GPL by default. Purchasing a commercial license allows use outside of the GPL, under the Commercial License terms. Read details at: [isotope.metafizzy.co/license.html](http://isotope.metafizzy.co/license.html)
 + Added [`arrangeComplete` event](http://isotope.metafizzy.co/events.html#arrangecomplete). Fixed [#732](https://github.com/metafizzy/isotope/issues/732)
 + Changed `bower.json` `main` to just `js/isotope.js`. Resolved [#879](https://github.com/metafizzy/isotope/issues/879)
 + Added [fizzy-ui-utils](https://github.com/metafizzy/fizzy-ui-utils)
++ Removed `isoInstance` argument from `layoutComplete` and `removeComplete` events
 
 ### v2.1.1