TST: Fix pytest unrecognized arguments

[iLtc]

This PR fixes #60.

I checked the command-line options for pytest-cov here. I believe it is --cov-report instead of --cov-repo.

Edit 1: I also updated the version of pandas to 0.23 so it can pass the tests on AppVeyor.

Edit 2: For some reason, travis-ci has not been triggered for this PR. You can see the test results on my branch: https://travis-ci.com/github/iLtc/gdeltPyR/builds/195321421.

[codecov-io]

Codecov Report

Merging #70 into master will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##           master      #70   +/-   ##
=======================================
  Coverage   98.31%   98.31%           
=======================================
  Files           9        9           
  Lines         474      474           
=======================================
  Hits          466      466           
  Misses          8        8           

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[coveralls]

Coverage remained the same at 98.312% when pulling 737e1f094f7070901f364e70f6fb8438c41754dd on iLtc:fix-pytest into 78540c82663c09b76d2a533f4c07f96dfdf2efcc on linwoodc3:master.

[coveralls]

Coverage remained the same at 98.312% when pulling 737e1f094f7070901f364e70f6fb8438c41754dd on iLtc:fix-pytest into 78540c82663c09b76d2a533f4c07f96dfdf2efcc on linwoodc3:master.

[linwoodc3]

I am super late, but just getting to look at this since gdeltPyr broke and received a few emails. if you are still around, be on the look out for questions.