Update .travis.yml

[MauriceHendrix]

Description

Motivation and Context

Types of changes

• [ ] 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 change)

Documentation checklist

• [ ] I have updated all documentation in the code where necessary.
• [ ] I have checked spelling in all (new) comments and documentation.
• [ ] I have added a note to RELEASE.md if relevant (new feature, breaking change, or notable bug fix).

Testing

• [x] Testing is done automatically and codecov shows test coverage
• [ ] This cannot be tested automatically

[codecov[bot]]

Codecov Report

Merging #311 into develop will not change coverage. The diff coverage is n/a.

@@            Coverage Diff            @@
##           develop      #311   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            8         8           
  Lines         1361      1361           
  Branches       298       298           
=========================================
  Hits          1361      1361           

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