Correct Podspec licence declaration to MIT
Correct Podspec licence declaration to MIT

The project's LICENSE.txt declares an MIT licence, but this was not reflected in the podspec, which indicated a "Proprietary" licence.
BranchMetrics/ios-branch-deep-linking,BranchMetrics/ios-branch-deep-linking,BranchMetrics/ios-branch-deep-linking,BranchMetrics/ios-branch-deep-linking