[SPM] Add .build and Packages to .gitignore
[SPM] Add .build and Packages to .gitignore

firebase/SwiftLint,victorpimentel/SwiftLint,jeffreybergier/SwiftLint,lyft/SwiftLint,victorpimentel/SwiftLint,cdillard/SwiftLint,firebase/SwiftLint,jeffreybergier/SwiftLint,firebase/SwiftLint,cdillard/SwiftLint,Johnykutty/SwiftLint,wfleming/SwiftLint,wfleming/SwiftLint,realm/SwiftLint,jeffreybergier/SwiftLint,lyft/SwiftLint,realm/SwiftLint,firebase/SwiftLint,victorpimentel/SwiftLint,lyft/SwiftLint,Johnykutty/SwiftLint,lyft/SwiftLint,jeffreybergier/SwiftLint,realm/SwiftLint,Johnykutty/SwiftLint,victorpimentel/SwiftLint,Johnykutty/SwiftLint,realm/SwiftLint