chore(package): update rollup-plugin-terser to version 5.1.3

Closes #36

Author: greenkeeper[bot]

package.json

@@ -120,7 +120,7 @@
     "rollup-plugin-node-resolve": "4.2.3",
     "rollup-plugin-replace": "2.2.0",
     "rollup-plugin-sourcemaps": "0.4.2",
-    "rollup-plugin-terser": "4.0.4",
+    "rollup-plugin-terser": "5.1.3",
     "rollup-plugin-uglify": "6.0.2",
     "shx": "0.3.2",
     "sort-object-keys": "1.1.2",