update change log for #171 and #177

Author: nycdotnet

CHANGELOG.md

@@ -5,6 +5,8 @@
 * FEAT: support watching multiple DIRS. (https://github.com/grunt-ts/grunt-ts/pull/155/)
 * CHORE: Use lodash instead of underscore (https://github.com/TypeStrong/grunt-ts/pull/161)
 * DOCS: More sample config for gruntfile (https://github.com/TypeStrong/grunt-ts/pull/166)
+* FEAT: support for `files` in gruntfile (https://github.com/TypeStrong/grunt-ts/pull/171)
+* FIX: missing tsc.js will now fail the build step (#177)
 
 ## v1.12.0
 * ENANCEMENT: Transforms are run even when the compile option is false