Merge pull request mozilla#281 from tromey/install-typings-file

Add source-map.d.ts to files in package.json

Author: tromey

package.json

@@ -49,6 +49,7 @@
   "main": "./source-map.js",
   "files": [
     "source-map.js",
+    "source-map.d.ts",
     "lib/",
     "dist/source-map.debug.js",
     "dist/source-map.js",