Remove travis CI config

[notaphplover]

Description

• Removed unused TravisCI config

How Has This Been Tested?

• Test passes sucessfully.

Types of changes

• Updated docs / Refactor code / Added a tests case (non-breaking change)
• 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)

Checklist:

• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes.
• All new and existing tests passed.
• I have updated the changelog.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Please upload report for BASE (master@98fb990). Learn more about missing BASE report.
Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff            @@
##             master    #1615   +/-   ##
=========================================
  Coverage          ?   99.53%           
=========================================
  Files             ?       50           
  Lines             ?     1492           
  Branches          ?      189           
=========================================
  Hits              ?     1485           
  Misses            ?        4           
  Partials          ?        3           

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