Update .travis.yml

[nageshlop]

Add support for architecture ppc64le. This is part of the Ubuntu distribution for ppc64le.
This helps us simplify testing later when distributions are re-building and re-releasing.
The build and test results are available at the below location.
https://travis-ci.com/github/nageshlop/azure-storage-python

[nageshlop]

Hi,
Could you review this request.

[xiafu-msft]

Thanks for the pull request! It looks great

[nageshlop]

Hi @xiafu-msft
Thanks for considering the request. Could you help to merge changes.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 86.98%. Comparing base (4306898) to head (621d481).
⚠️ Report is 4 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #685      +/-   ##
==========================================
- Coverage   87.05%   86.98%   -0.07%     
==========================================
  Files          52       52              
  Lines        5308     5288      -20     
  Branches      570      566       -4     
==========================================
- Hits         4621     4600      -21     
  Misses        515      515              
- Partials      172      173       +1     

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