Add deprecation notices, deprecation warning on install

[awharn]

What It Does

Adds deprecation notice to the readme and on post-install, which may not be visible on newer versions of node

How to Test

Install the plug-in on Node 12

Review Checklist
I certify that I have:

• tested my changes
• added/updated automated tests
• updated the changelog
• followed the contribution guidelines

Additional Comments

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (b46c905) 90.31% compared to head (68ecb5c) 90.31%.

Additional details and impacted files

@@             Coverage Diff              @@
##           zowe-v1-lts      #66   +/-   ##
============================================
  Coverage        90.31%   90.31%           
============================================
  Files               40       40           
  Lines              764      764           
  Branches           191      191           
============================================
  Hits               690      690           
  Misses              72       72           
  Partials             2        2           

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[awharn]

Don't worry about the failing audit check - because we have our peer dependency on an early version of Imperative, Node is trying to install that particular version, which has dependencies on vulnerable versions of semver.

[zFernand0]

LGTM! 😋

Q: do we plan to publish this as a patch (and then deprecate the entire package) ?

[sonarqubecloud]

Quality Gate passed

Kudos, no new issues were introduced!

0 New issues
0 Security Hotspots
No data about Coverage
0.0% Duplication on New Code

See analysis details on SonarCloud

[github-actions]

Release succeeded for the zowe-v1-lts branch. 🎉

The following packages have been published:

• npm: @zowe/[email protected]

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