Bumped default Ghost API version to v2
Bumped default Ghost API version to v2

no issue

- This change is due to Content API becoming stable https://github.com/TryGhost/Ghost/releases/tag/2.10.0
eduardochiaro/Casper-Light,eidolem/casper,sawilde/Casper,TryGhost/Casper,ImKcat/ImKcatCasper,russmckendrick/Casper,jedidja/Casper,eduardochiaro/Casper-Light,eidolem/casper,alvareztech/Casper,matitalatina/Casper,jedidja/Casper,dlecina/StayPuft,dlew/Casper,alvareztech/Casper,sawilde/Casper,dlecina/StayPuft,matitalatina/Casper,Inchdev/blog-theme,Inchdev/blog-theme