Removed unused travis config code

[etr]

Description of the Change

Remove unused configurations from .travis.yml

Possible Drawbacks

Travis malfunctioning

Verification Process

Run through travis itself

Release Notes

Remove unused configurations from .travis.yml

[codecov-io]

Codecov Report

Merging #188 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #188   +/-   ##
=======================================
  Coverage   95.19%   95.19%           
=======================================
  Files          35       35           
  Lines        3140     3140           
=======================================
  Hits         2989     2989           
  Misses        151      151

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update bc700b5...df428a5. Read the comment docs.