Remove cache property from Travis.
Remove cache property from Travis.

Only available on Travis Pro.

Tayamarn/socorro,adngdb/socorro,yglazko/socorro,yglazko/socorro,linearregression/socorro,mozilla/socorro,m8ttyB/socorro,lonnen/socorro,AdrianGaudebert/socorro,twobraids/socorro,cliqz/socorro,rhelmer/socorro,cliqz/socorro,linearregression/socorro,luser/socorro,luser/socorro,rhelmer/socorro,KaiRo-at/socorro,m8ttyB/socorro,adngdb/socorro,mozilla/socorro,spthaolt/socorro,adngdb/socorro,luser/socorro,yglazko/socorro,cliqz/socorro,pcabido/socorro,Serg09/socorro,adngdb/socorro,twobraids/socorro,m8ttyB/socorro,Tayamarn/socorro,KaiRo-at/socorro,Tchanders/socorro,AdrianGaudebert/socorro,cliqz/socorro,pcabido/socorro,rhelmer/socorro,Tchanders/socorro,spthaolt/socorro,Tchanders/socorro,twobraids/socorro,AdrianGaudebert/socorro,cliqz/socorro,linearregression/socorro,twobraids/socorro,linearregression/socorro,KaiRo-at/socorro,mozilla/socorro,AdrianGaudebert/socorro,m8ttyB/socorro,mozilla/socorro,KaiRo-at/socorro,pcabido/socorro,Serg09/socorro,luser/socorro,luser/socorro,lonnen/socorro,lonnen/socorro,spthaolt/socorro,adngdb/socorro,AdrianGaudebert/socorro,Tayamarn/socorro,Tayamarn/socorro,Tchanders/socorro,mozilla/socorro,Tchanders/socorro,KaiRo-at/socorro,pcabido/socorro,rhelmer/socorro,Serg09/socorro,Serg09/socorro,m8ttyB/socorro,spthaolt/socorro,yglazko/socorro,KaiRo-at/socorro,rhelmer/socorro,Tayamarn/socorro,Serg09/socorro,pcabido/socorro,m8ttyB/socorro,mozilla/socorro,linearregression/socorro,yglazko/socorro,twobraids/socorro,Tayamarn/socorro,twobraids/socorro,adngdb/socorro,linearregression/socorro,lonnen/socorro,yglazko/socorro,spthaolt/socorro,luser/socorro,spthaolt/socorro,Tchanders/socorro,pcabido/socorro,Serg09/socorro,AdrianGaudebert/socorro,cliqz/socorro,rhelmer/socorro