version of dependency doesn't update in node_modules if you change it in package.json

Environment
Provide version numbers for the following components (information can be retrieved by running tns info in your project folder or by inspecting the package.json of the project):

• CLI: 6.0.2

Describe the bug
Change a version of a dependency in a package.json and run the project. You will see that the version doesn't update in node_modules.

To Reproduce

1. tns create app --js
2. set nativescript-dev-webpack to be 1.0.1 in package.json and run app
3. You will see that the version in node_modules/nativescript-dev-webpack/package.json is 1.0.2

Expected behavior
version should update

先使用 tns create app --js 重現問題，然後在執行應用程式後，將 package.json 中的相依性版本與 node_modules/nativescript-dev-webpack/package.json 進行比較。追蹤 CLI 的相依性安裝或專案執行進入點；完成的標準是，變更要求的版本會更新已安裝的相依性，而不是繼續保留 1.0.2。