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

Closes #60

Author: greenkeeper[bot]

package.json

@@ -108,7 +108,7 @@
     "rollup-plugin-commonjs": "^9.1.8",
     "rollup-plugin-json": "^4.0.0",
     "rollup-plugin-node-resolve": "^4.2.3",
-    "rollup-plugin-sourcemaps": "^0.4.2",
+    "rollup-plugin-sourcemaps": "^0.6.2",
     "rollup-plugin-typescript2": "^0.21.0",
     "semantic-release": "^15.9.16",
     "shelljs": "^0.8.3",