Update rlsnotes

RELEASE-NOTES.md

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 ### Version 1.9.4 - February 21, 2015
 
 - **Build Tools** - Fixed issue with recursive merge for site themes in update scripts, [details here](https://github.com/Semantic-Org/Semantic-UI/pull/1845) Thanks @derekslife
+- **API** - Added `was cancelled` to determine whether request was cancelled by `beforeSend`
+- **State** - Text states now handle `cancelled` API requests correctly
 - **Search** - Category search no longer displays unnecessary error message about setting maxResults
 - **Composer** - Composer.json should now read version from tags, adjusted some fields.
 - **Grid** - Stackable grid now has horizontal padding on mobile unless inside a `ui grid` or `ui segment`