Add SPM's .build directory to .gitignore
Add SPM's .build directory to .gitignore

Quick/Nimble,dgdosen/Nimble,feinstruktur/Nimble,ashfurrow/Nimble,ashfurrow/Nimble,phatblat/Nimble,twobitlabs/Nimble,jeffh/Nimble,AnthonyMDev/Nimble,DanielAsher/Nimble,jeffh/Nimble,Quick/Nimble,mishimay/Nimble,jeffh/Nimble,abbeycode/Nimble,Quick/Nimble,feinstruktur/Nimble,phatblat/Nimble,abbeycode/Nimble,mishimay/Nimble,DanielAsher/Nimble,twobitlabs/Nimble,abbeycode/Nimble,phatblat/Nimble,DanielAsher/Nimble,AnthonyMDev/Nimble,dgdosen/Nimble,twobitlabs/Nimble,feinstruktur/Nimble,dgdosen/Nimble,jeffh/Nimble,ashfurrow/Nimble,AnthonyMDev/Nimble,mishimay/Nimble,dgdosen/Nimble,abbeycode/Nimble