Only include source files in npm package

This will keep the size of the bundle down.

Author: trotzig

package.json

@@ -3,6 +3,9 @@
   "version": "1.0.0-rc.1",
   "description": "A javascript library to diff two images. Uses the Longest-Common-Subsequence algorithm to allow content to shift. ",
   "main": "src/index.js",
+  "files": [
+    "src"
+  ],
   "author": "Henric Trotzig <[email protected]>",
   "contributors": [
     "Joe Lencioni <[email protected]> (https://github.com/lencioni)"