Pin dependencies (#354)

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

Author: renovate[bot]

package.json

@@ -12,14 +12,14 @@
     "dependencies": {
         "chalk": "3.0.0",
         "commander": "4.0.1",
-        "strip-json-comments": "^3.0.1",
+        "strip-json-comments": "3.0.1",
         "tslint": "5.20.1",
         "typescript": "3.7.4"
     },
     "devDependencies": {
         "@babel/core": "7.7.7",
-        "@babel/plugin-proposal-nullish-coalescing-operator": "^7.7.4",
-        "@babel/plugin-proposal-optional-chaining": "^7.7.5",
+        "@babel/plugin-proposal-nullish-coalescing-operator": "7.7.4",
+        "@babel/plugin-proposal-optional-chaining": "7.7.5",
         "@babel/preset-env": "7.7.7",
         "@babel/preset-typescript": "7.7.7",
         "@types/jest": "24.0.24",