Finish new files with an empty line

[mgol]

After converting a CLI app into an nx one via https://nrwl.io/nx/guide-nx-workspace#convert-an-angularcli-project-to-an-nx-workspace my package.json & .angular-cli.json are missing empty lines at their ends. Many editors add such an empty line automatically as it reduces noise in Git diffs (otherwise adding a line at the end creates a difference in two lines as a line break is counted into the preceding line).

Most tools like npm or Yarn generate JSON files with a trailing new line as well so it'd be good to align.

[mgol]

(checked with CLI 1.5.0-rc.3 & @nrwl/schematics 0.0.7)

[vsavkin]

Fixed here c09ba79

[github-actions]

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