Add warnings for deprecated shell commands

[cgewecke]

Ex:

$ testrpc-sc

$ solidity-coverage

[codecov-io]

Codecov Report

❗ No coverage uploaded for pull request base (truffle-plugin@b6af63d). Click here to learn what that means.
The diff coverage is 100%.

@@                Coverage Diff                @@
##             truffle-plugin     #405   +/-   ##
=================================================
  Coverage                  ?   96.83%           
=================================================
  Files                     ?       13           
  Lines                     ?      631           
  Branches                  ?        0           
=================================================
  Hits                      ?      611           
  Misses                    ?       20           
  Partials                  ?        0

Impacted Files	Coverage Δ
lib/ui.js	100% <ø> (ø)
dist/bin.js	100% <100%> (ø)

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update b6af63d...cdf4f85. Read the comment docs.

[yxliang01]

@cgewecke Want to add https:// to the URL? :)

[cgewecke]

@yxliang01 When I copy paste the unprefixed url into the browser it resolves automatically. And looks cleaner/simpler to me, idk.

Open to persuasion though.

[yxliang01]

@cgewecke What if in different browser or directly clicking on the link? Under that case, I believe it depends on the default protocol of the related software (potentially, terminal emulator + browser). So far, for the links I normally see in CLI, I would see them prefixed with https:// , but not a big issue also I guess.

[cgewecke]

@yxliang01 Yes you're right about this - no one else omits the protocol. Will fix.