chore(deps): update dependency handlebars to v4.7.7 [security]

Author: renovate-bot

package-lock.json

@@ -79,7 +79,7 @@
     "eslint-plugin-mocha": "6.2.2",
     "eslint-plugin-prettier": "3.1.2",
     "generate-changelog": "1.8.0",
-    "handlebars": "4.6.0",
+    "handlebars": "4.7.7",
     "husky": "3.1.0",
     "lint-staged": "9.5.0",
     "lodash.template": "4.5.0",