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

Closes #43

Author: greenkeeper[bot]

package.json

@@ -113,7 +113,7 @@
     "rollup": "^0.56.3",
     "rollup-plugin-commonjs": "^9.0.0",
     "rollup-plugin-node-resolve": "^3.0.0",
-    "rollup-plugin-sourcemaps": "^0.4.2",
+    "rollup-plugin-sourcemaps": "^0.6.2",
     "rollup-plugin-typescript2": "^0.12.0",
     "rxjs": "^5.5.6",
     "rxjs-marbles": "^2.3.1",