[SPM] Disable `make spm_test` on Travis-CI until SR-989 will be fixed
[SPM] Disable `make spm_test` on Travis-CI until SR-989 will be fixed

https://bugs.swift.org/browse/SR-989

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