Fix ts dependency match

Author: vidartf

{{cookiecutter.github_project_name}}/packages/{{ cookiecutter.npm_package_name }}/package.json

@@ -41,7 +41,7 @@
     "mocha": "^3.5.0",
     "source-map-loader": "^0.2.1",
     "ts-loader": "^2.3.2",
-    "typescript": "^2.4.2",
+    "typescript": "~2.4.2",
     "webpack": "^3.4.1"
   },
   "repository": {