[podspec] Update cocoapods_version to `>= 1.7.0` to use `swift_versions` DSL (#757)
[podspec] Update cocoapods_version to `>= 1.7.0` to use `swift_versions` DSL (#757)


ReactiveCocoa/ReactiveSwift,ReactiveCocoa/ReactiveSwift,ReactiveCocoa/ReactiveSwift