chore(package): update rollup-plugin-uglify to version 5.0.2

Closes #50

Author: greenkeeper[bot]

package.json

@@ -44,7 +44,7 @@
     "rollup-plugin-node-resolve": "~3.3.0",
     "rollup-plugin-commonjs": "~8.3.0",
     "rollup-plugin-sourcemaps": "~0.4.2",
-    "rollup-plugin-uglify": "~3.0.0",
+    "rollup-plugin-uglify": "~5.0.2",
     "jest": "~22.4.3",
     "jest-junit-reporter": "~1.1.0",
     "ts-jest": "~22.4.6",