Update rollup-plugin-closure-compiler

Author: David-Else

package.json

@@ -15,7 +15,7 @@
   "author": "",
   "license": "ISC",
   "devDependencies": {
-    "@ampproject/rollup-plugin-closure-compiler": "^0.10.0",
+    "@ampproject/rollup-plugin-closure-compiler": "^0.12.0",
     "@types/mocha": "^5.2.7",
     "@types/node": "^12.11.2",
     "@typescript-eslint/eslint-plugin": "^2.5.0",