converted README and version as file

[StrikerRUS]

Checklist

• I have made a material change to the repo (functionality, testing, spelling, grammar)
• I have read the [Contribution Guide] and my PR follows them.
• I updated my branch with the master branch.
• I have added tests that prove my fix is effective or that my feature works
• [n/a] I have added necessary documentation about the functionality in the appropriate .md file
• [n/a] I have added in line documentation to the code I modified

Short description of what this PR does:

• add standard __version__ attribute to the package. This attribute is read from the VERSION.txt file, so in the future version should be incremented only in the file (related to Implement auto-deploy to package manager #92).
• convert README.md to README.rst (appearance can be checked in this branch https://github.com/StrikerRUS/python-http-client/blob/pypi/README.rst), so setup.cfg and register.py are not needed anymore.
• add Python versions badge.
  
• add PyPI version badge.
  

[SendGridDX]

All committers have signed the CLA.

[codecov]

Codecov Report

Merging #93 into master will increase coverage by 0.11%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master      #93      +/-   ##
==========================================
+ Coverage   91.34%   91.46%   +0.11%     
==========================================
  Files           6        6              
  Lines         289      293       +4     
==========================================
+ Hits          264      268       +4     
  Misses         25       25

Impacted Files	Coverage Δ
tests/test_repofiles.py	100% <ø> (ø)	⬆️
python_http_client/__init__.py	100% <100%> (ø)	⬆️

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[StrikerRUS]

All tests on Travis are green, but the status on GitHub hasn't been updated. If it's an issue, then closing and reopening the PR can help.
Not actual anymore.

[thinkingserious]

Hello @StrikerRUS,

Thanks again for the PR!

It's HACKTOBERFEST! We want to show our appreciation by sending you some special Hacktoberfest swag. If you have not already, could you please fill out this form so we can send it to you? Thanks!

Team SendGrid DX

[thinkingserious]

This is awesome @StrikerRUS! Would you mind doing the same for our other Python repos?

https://github.com/sendgrid/sendgrid-python
https://github.com/sendgrid/smtpapi-python
https://github.com/sendgrid/open-source-library-data-collector
https://github.com/sendgrid/dx-automator

Thanks!

With Best Regards,

Elmer

[StrikerRUS]

@thinkingserious Thanks a lot for the kind words!

Sure, I'll create PRs for other repos.
BTW, the similar PR for sendgrid-python has been already created: sendgrid/sendgrid-python#634.

[StrikerRUS]

@thinkingserious Here're updates about PRs. Please take a look.

• sendgrid/sendgrid-python: converted README to reStructuredText and version as plain text file sendgrid-python#634 converted README to reStructuredText and version as plain text file sendgrid-python#663.
• sendgrid/smtpapi-python: fix: fixed Travis, converted README and version as file smtpapi-python#75.
• sendgrid/open-source-library-data-collector: fixed Travis, converted README and version as file open-source-library-data-collector#138.
• sendgrid/dx-automator: Not needed.