What do these changes do?

Allow to compress ES requests with gzip

Are there changes in behavior for the user?

Optional parameter http_compress for connection class

Related issue number

Issue 72

Checklist

• [ ] I think the code is well written
• [x] Unit tests for the changes exist
• [ ] Documentation reflects the changes
• [ ] If you provide code modification, please add yourself to CONTRIBUTORS.txt
  • The format is <Name> <Surname>.
  • Please keep alphabetical order, the file is sorted by names.
• [ ] Add a new news fragment into the CHANGES folder
  • name it <issue_id>.<type> (e.g. 588.bugfix)
  • if you don't have an issue_id change it to the pr id after creating the PR
  • ensure type is one of the following:
    • .feature: Signifying a new feature.
    • .bugfix: Signifying a bug fix.
    • .doc: Signifying a documentation improvement.
    • .removal: Signifying a deprecation or removal of public API.
    • .misc: A ticket has been closed, but it is not of interest to users.
  • Make sure to use full sentences with correct case and punctuation, for example: Fix issue with non-ascii contents in doctest text files.

Codecov Report

Merging #160 into master will increase coverage by <.01%. The diff coverage is 100%.

@@            Coverage Diff             @@
##           master     #160      +/-   ##
==========================================
+ Coverage   98.37%   98.37%   +<.01%     
==========================================
  Files           6        6              
  Lines         430      431       +1     
  Branches       76       76              
==========================================
+ Hits          423      424       +1     
  Misses          4        4              
  Partials        3        3

Impacted Files	Coverage Δ
aioelasticsearch/connection.py	100% <100%> (ø)	:arrow_up:

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