Pinning GDAL version to resolve compatibility issue with Fiona

[dphogan]

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Description

Reverting version of GDAL since latest version causes an issue with Fiona.

Fixes #343

Type of change

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• [X] Bug fix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to not work as expected - these changes will not be merged until major releases!)

How Has This Been Tested?

Please describe tests that you added to the pytest codebase (if applicable).

Checklist:

• [X] My PR has a descriptive title
• [X] My code follows PEP8
• [X] I have performed a self-review of my own code
• [ ] I have commented my code, particularly in hard-to-understand areas
• [ ] I have made corresponding changes to the documentation
• [ ] My changes generate no new errors
• [ ] I have added tests that prove my fix is effective or that my feature works
• [ ] My PR passes Travis CI tests
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[codecov[bot]]

Codecov Report

Merging #346 into dev will not change coverage by %. The diff coverage is n/a.

@@           Coverage Diff           @@
##              dev     #346   +/-   ##
=======================================
  Coverage   64.54%   64.54%           
=======================================
  Files          72       72           
  Lines        5328     5328           
=======================================
  Hits         3439     3439           
  Misses       1889     1889           

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