chore(package): update rollup-plugin-sourcemaps to version 0.6.2

Closes #81

Author: greenkeeper[bot]

package.json

@@ -104,7 +104,7 @@
     "npm-watch": "^0.2.0",
     "rimraf": "^2.6.1",
     "rollup": "^0.42.0",
-    "rollup-plugin-sourcemaps": "^0.4.1",
+    "rollup-plugin-sourcemaps": "^0.6.2",
     "rollup-plugin-uglify": "^2.0.1",
     "rxjs": "^5.0.1",
     "systemjs": "^0.20.12",