Updated CONTRIBUTING to mention changing xcode configurations
Updated CONTRIBUTING to mention changing xcode configurations

DanielAsher/Nimble,Quick/Nimble,ScottRobbins/Nimble,alvinvarghese/Nimble,joemasilotti/Nimble,mishimay/Nimble,dgdosen/Nimble,msdgwzhy6/Nimble,feinstruktur/Nimble,phatblat/Nimble,ashfurrow/Nimble,AnthonyMDev/Nimble,feinstruktur/Nimble,abbeycode/Nimble,Quick/Nimble,dgdosen/Nimble,DanielAsher/Nimble,feinstruktur/Nimble,jeffh/Nimble,msdgwzhy6/Nimble,mishimay/Nimble,vtongcoder/Nimble,nikita-leonov/Nimble,abbeycode/Nimble,alvinvarghese/Nimble,vtongcoder/Nimble,msdgwzhy6/Nimble,abbeycode/Nimble,twobitlabs/Nimble,phatblat/Nimble,DanielAsher/Nimble,dgdosen/Nimble,ashfurrow/Nimble,jeffh/Nimble,joemasilotti/Nimble,alvinvarghese/Nimble,ScottRobbins/Nimble,joemasilotti/Nimble,AnthonyMDev/Nimble,phatblat/Nimble,ashfurrow/Nimble,vtongcoder/Nimble,msdgwzhy6/Nimble,jeffh/Nimble,jeffh/Nimble,nikita-leonov/Nimble,nikita-leonov/Nimble,dgdosen/Nimble,AnthonyMDev/Nimble,Quick/Nimble,twobitlabs/Nimble,abbeycode/Nimble,mishimay/Nimble,alvinvarghese/Nimble,twobitlabs/Nimble,ScottRobbins/Nimble