chore(package): update rollup-plugin-sourcemaps to version 0.6.1

Closes #327

Author: greenkeeper[bot]

package.json

@@ -105,7 +105,7 @@
     "rollup-plugin-commonjs": "^9.1.8",
     "rollup-plugin-json": "^3.1.0",
     "rollup-plugin-node-resolve": "^3.4.0",
-    "rollup-plugin-sourcemaps": "^0.4.2",
+    "rollup-plugin-sourcemaps": "^0.6.1",
     "rollup-plugin-typescript2": "^0.18.0",
     "semantic-release": "^15.9.16",
     "shelljs": "^0.8.3",