feat: show up cli flag aliases with webpack help <arg> #1647
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What kind of change does this PR introduce?
enhancement
Did you add tests for your changes?
Updated existing tests.
If relevant, did you update the documentation?
Nope
Summary
![Screenshot 2020-06-24 at 1 43 28 PM](https://user-images.githubusercontent.com/25279263/85520564-b62f8e00-b620-11ea-81cf-ad6005b5a1e7.png)
Help information for individual
cli-flags
shows up the corresponding alias if it exists.Does this PR introduce a breaking change?
Nope
Other information
N/A