feat: add uglify-js

[fulls1z3]

** PR Checklist
Please check if your PR fulfills the following requirements:

• The commit message follows our guidelines: https://github.com/azure-seed/azure-functions-typescript/blob/master/CONTRIBUTING.md#commit
• Tests for the changes have been added (for bug fixes / features)
• Docs have been added / updated (for bug fixes / features)

** PR Type
What kind of change does this PR introduce?

[ ] Bugfix
[x] Feature
[ ] Code style update (formatting, local variables)
[ ] Refactoring (no functional changes, no api changes)
[ ] Build related changes
[ ] CI related changes
[x] Documentation content changes
[ ] Other... Please describe:

** What is the current behavior?

Issue Number: N/A

** What is the new behavior?

** Does this PR introduce a breaking change?

[ ] Yes
[x] No

** Other information

[codecov]

Codecov Report

Merging #16 into master will not change coverage.
The diff coverage is n/a.

@@          Coverage Diff          @@
##           master    #16   +/-   ##
=====================================
  Coverage     100%   100%           
=====================================
  Files           1      1           
  Lines          36     36           
  Branches        9      9           
=====================================
  Hits           36     36

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