Update tests/travis/README.md
Update tests/travis/README.md

A rather cosmetic change introducing [relative links](https://github.com/blog/1395-relative-links-in-markup-files).
ImAnilChaudhari/yii,longhua828/yii,auburus/yii,dbalencar/yii,longhua828/yii,er361/yii-zadanie-somnium,sachintaware/yii,YaDelivery/yii,ImAnilChaudhari/yii,lubosdz/yii,yiichina/yii,lsjing/yii,janisto/yii,lubosdz/yii,lsjing/yii,GerrGIT/yii,er361/yii-zadanie-somnium,YaDelivery/yii,mudrezzz/testphp,l3xthanzero/trackstar,Vartacom/yii,wbfree/yii-tutorial,longhua828/yii,lubosdz/yii,phoenix3008/yii,l3xthanzero/trackstar,licailing/yii,kurorido1990/dev-github,licailing/yii,kurorido1990/dev-github,makasim/PayumYiiExtensionSandbox,trewor-kapusta/yii,janisto/yii,marcovtwout/yii,intersvyaz/yii,dbalencar/yii,ImAnilChaudhari/yii,tvs-prarthana/yii,YaDelivery/yii,guber007/yii,auburus/yii,yiisoft/yii,phoenix3008/yii,Yanan1021/yii,tvs-prarthana/yii,intersvyaz/yii,auburus/yii,makasim/PayumYiiExtensionSandbox,scriptius/blog,licailing/yii,lsjing/yii,marcovtwout/yii,YaDelivery/yii,longhua828/yii,janisto/yii,Vartacom/yii,makasim/PayumYiiExtensionSandbox,tvs-prarthana/yii,mudrezzz/testphp,l3xthanzero/trackstar,scriptius/blog,trewor-kapusta/yii,lsjing/yii,kurorido1990/dev-github,dbalencar/yii,jackey/YiiAPI-Framework,GerrGIT/yii,sachintaware/yii,yiichina/yii,yiisoft/yii,Infowatch/yii,Corfiot/yii,ImAnilChaudhari/yii,marcovtwout/yii,guber007/yii,sachintaware/yii,Yanan1021/yii,kurorido1990/dev-github,tvs-prarthana/yii,makasim/PayumYiiExtensionSandbox,auburus/yii,softark/yii,Vartacom/yii,lubosdz/yii,phoenix3008/yii,Infowatch/yii,intersvyaz/yii,softark/yii,yiichina/yii,phoenix3008/yii,jackey/YiiAPI-Framework,er361/yii-zadanie-somnium,marcovtwout/yii,mudrezzz/testphp,er361/yii-zadanie-somnium,guber007/yii,Corfiot/yii,GerrGIT/yii,mudrezzz/testphp,licailing/yii,Vartacom/yii,guber007/yii,GerrGIT/yii,janisto/yii,wbfree/yii-tutorial,Yanan1021/yii,sachintaware/yii,scriptius/blog,scriptius/blog