Add feature flag for rustls

[tilosp]

No description provided.

[tilosp]

@poljar is there any reason for running the ci twice, once on travis-ci.com and once on travis-ci.org.
If there is no reason this repo should be disabled on travis-ci.org, since travis-ci.com will replace it eventually and has more features.

[codecov-commenter]

Codecov Report

Merging #89 into master will increase coverage by 0.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master      #89      +/-   ##
==========================================
+ Coverage   75.70%   75.71%   +0.01%     
==========================================
  Files          31       31              
  Lines        6865     6865              
==========================================
+ Hits         5197     5198       +1     
+ Misses       1668     1667       -1     

Impacted Files	Coverage Δ
matrix_sdk_crypto/src/verification/sas/helpers.rs	84.68% <0.00%> (+0.45%)	⬆️

---

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[poljar]

Codecov Report

Merging #89 into master will increase coverage by 0.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master      #89      +/-   ##
==========================================
+ Coverage   75.70%   75.71%   +0.01%     
==========================================
  Files          31       31              
  Lines        6865     6865              
==========================================
+ Hits         5197     5198       +1     
+ Misses       1668     1667       -1     

Impacted Files Coverage Δ
matrix_sdk_crypto/src/verification/sas/helpers.rs 84.68% <0.00%> (+0.45%) arrow_up

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 176181b...a57c615. Read the comment docs.

We're using proptest for some of our tests, so sometimes a test run has a lower coverage, sometimes a bit higher.

[poljar]

@poljar is there any reason for running the ci twice, once on travis-ci.com and once on travis-ci.org.
If there is no reason this repo should be disabled on travis-ci.org, since travis-ci.com will replace it eventually and has more features.

I didn't have the rights to change CI settings and forgot to check after, I think I disabled now the .org one.