Pin dependency json5 to 2.1.3 (#765)

Co-authored-by: Renovate Bot <bot@renovateapp.com>

Author: renovate[bot]

package.json

@@ -15,7 +15,7 @@
         "cson-parser": "4.0.5",
         "eslint-config-prettier": "6.14.0",
         "glob": "7.1.6",
-        "json5": "^2.1.3",
+        "json5": "2.1.3",
         "lodash": "4.17.20",
         "minimatch": "3.0.4",
         "tslint": "6.1.3",