Repair requests range pin to include higher versions. (#4916)
Repair requests range pin to include higher versions. (#4916)

Problem

Currently, the version pinning for requests is malformed and implicitly pinned to 2.5.0.

Solution

Use >= vs == to permit usage of later requests versions.

Result

Before:

[omerta pants (d89eb359)]$ ./pants 2>&1 | grep requests
Collecting requests[security]<2.19,==2.5.0 (from -r /Users/kwilson/dev/pants/3rdparty/python/requirements.txt (line 25))
  Using cached requests-2.5.0-py2.py3-none-any.whl
...
After:

[omerta pants (kwlzn/requests_pin)]$ ./pants 2>&1 | grep requests
Collecting requests[security]<2.19,>=2.5.0 (from -r /Users/kwilson/dev/pants/3rdparty/python/requirements.txt (line 25))
  Using cached requests-2.18.4-py2.py3-none-any.whl
...
benjyw/pants,wisechengyi/pants,tdyas/pants,pantsbuild/pants,wisechengyi/pants,tdyas/pants,pantsbuild/pants,fkorotkov/pants,benjyw/pants,tdyas/pants,jsirois/pants,baroquebobcat/pants,tdyas/pants,fkorotkov/pants,wisechengyi/pants,twitter/pants,UnrememberMe/pants,tdyas/pants,twitter/pants,pantsbuild/pants,twitter/pants,UnrememberMe/pants,foursquare/pants,wisechengyi/pants,fkorotkov/pants,jsirois/pants,foursquare/pants,twitter/pants,tdyas/pants,baroquebobcat/pants,foursquare/pants,baroquebobcat/pants,pantsbuild/pants,UnrememberMe/pants,pantsbuild/pants,fkorotkov/pants,fkorotkov/pants,foursquare/pants,wisechengyi/pants,wisechengyi/pants,fkorotkov/pants,foursquare/pants,15Dkatz/pants,tdyas/pants,benjyw/pants,baroquebobcat/pants,twitter/pants,pantsbuild/pants,tdyas/pants,foursquare/pants,baroquebobcat/pants,jsirois/pants,baroquebobcat/pants,twitter/pants,foursquare/pants,benjyw/pants,twitter/pants,UnrememberMe/pants,benjyw/pants,15Dkatz/pants,15Dkatz/pants,benjyw/pants,UnrememberMe/pants,fkorotkov/pants,wisechengyi/pants,tdyas/pants,benjyw/pants,UnrememberMe/pants,15Dkatz/pants,fkorotkov/pants,twitter/pants,15Dkatz/pants,foursquare/pants,15Dkatz/pants,baroquebobcat/pants,15Dkatz/pants,wisechengyi/pants,UnrememberMe/pants,twitter/pants,UnrememberMe/pants,baroquebobcat/pants,wisechengyi/pants,foursquare/pants,baroquebobcat/pants,15Dkatz/pants,pantsbuild/pants,UnrememberMe/pants