Update tests/travis/README.md

A rather cosmetic change introducing [relative links](https://github.com/blog/1395-relative-links-in-markup-files).
Merge pull request #2464 from DaSourcerer/patch-18

Update tests/travis/README.md
fix small typo
Merge pull request #2466 from nsanden/fix-doc-typos

fix small typo
 [Uk] Updating documentation and fixing typos
[ci skip]
 [Uk] Fixing typos
[ci skip]
Merge pull request #2468 from yiiframework-com-ua/uk_docs

[Uk] Updating UK docs
 [Uk] Fixing typos
[ci skip]
 [Uk] Fixing typos
[ci skip]
Merge pull request #2469 from yiiframework-com-ua/uk_docs

[Uk] Updating UK docs
[ci skip]
Merge remote-tracking branch 'upstream/master'