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

Start by reproducing the issue with tns create app --js, then compare the dependency version in package.json with node_modules/nativescript-dev-webpack/package.json after running the app. Trace the CLI's dependency-install or project-run entry point; done means changing the requested version updates the installed dependency rather than retaining 1.0.2.