Use `.` for sourcing in fish
Use `.` for sourcing in fish

It appears that travis uses fish version without this command. Though `.` is 
deprecated on new versions it is still supported for backwards compatibility, 
thus may be used here.
EricSB/powerline,russellb/powerline,S0lll0s/powerline,keelerm84/powerline,magus424/powerline,kenrachynski/powerline,blindFS/powerline,cyrixhero/powerline,prvnkumar/powerline,dragon788/powerline,IvanAli/powerline,russellb/powerline,cyrixhero/powerline,EricSB/powerline,Luffin/powerline,magus424/powerline,seanfisk/powerline,russellb/powerline,S0lll0s/powerline,seanfisk/powerline,wfscheper/powerline,dragon788/powerline,lukw00/powerline,S0lll0s/powerline,Liangjianghao/powerline,bartvm/powerline,darac/powerline,bezhermoso/powerline,prvnkumar/powerline,kenrachynski/powerline,areteix/powerline,blindFS/powerline,bartvm/powerline,cyrixhero/powerline,DoctorJellyface/powerline,Luffin/powerline,junix/powerline,darac/powerline,xfumihiro/powerline,areteix/powerline,Liangjianghao/powerline,Luffin/powerline,IvanAli/powerline,bartvm/powerline,junix/powerline,kenrachynski/powerline,IvanAli/powerline,s0undt3ch/powerline,QuLogic/powerline,junix/powerline,EricSB/powerline,xfumihiro/powerline,lukw00/powerline,s0undt3ch/powerline,wfscheper/powerline,wfscheper/powerline,QuLogic/powerline,lukw00/powerline,bezhermoso/powerline,xxxhycl2010/powerline,xfumihiro/powerline,s0undt3ch/powerline,firebitsbr/powerline,QuLogic/powerline,seanfisk/powerline,dragon788/powerline,Liangjianghao/powerline,firebitsbr/powerline,magus424/powerline,darac/powerline,blindFS/powerline,xxxhycl2010/powerline,prvnkumar/powerline,areteix/powerline,DoctorJellyface/powerline,bezhermoso/powerline,firebitsbr/powerline,DoctorJellyface/powerline,keelerm84/powerline,xxxhycl2010/powerline