added web.im.replies

[moinism]

• I've read and understood the Contributing guidelines and have done my best effort to follow them.
• I've read and agree to the Code of Conduct.
• I've been mindful about doing atomic commits, adding documentation to my changes, not refactoring too much.
• I've a descriptive title and added any useful information for the reviewer. Where appropriate, I've attached a screenshot and/or screencast (gif preferrably).
• I've written tests to cover the new code and functionality included in this PR.
• I've read, agree to, and signed the Contributor License Agreement (CLA).

PR Summary

Adds im.replies to Web API

Related Issues

N/A

Test strategy

Already covered in tests.

[CLAassistant]

All committers have signed the CLA.

[codecov]

Codecov Report

Merging #339 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #339   +/-   ##
=======================================
  Coverage   85.72%   85.72%           
=======================================
  Files          44       44           
  Lines        1198     1198           
  Branches      176      176           
=======================================
  Hits         1027     1027           
  Misses        171      171

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[aoberoi]

LGTM!

[aoberoi]

note: will need to regenerate the docs after this merge.