Fix typo in podspec version quoting characters.
Fix typo in podspec version quoting characters.

chb/ResearchKit,chb/ResearchKit,jeremiahyan/ResearchKit,md0u80c9/ResearchKit,mluedke2/ResearchKit,jeremiahyan/ResearchKit,jeremiahyan/ResearchKit,mluedke2/ResearchKit,chb/ResearchKit,md0u80c9/ResearchKit,md0u80c9/ResearchKit,md0u80c9/ResearchKit,chb/ResearchKit,mluedke2/ResearchKit