Update podspec

Author: derek-robin

react-native-mdm.podspec

@@ -10,7 +10,7 @@ Pod::Spec.new do |s|
   s.license      = package['license']
   s.authors      = package['author']
   s.homepage     = "https://github.com/robinpowered/react-native-mdm"
-  s.platforms    = { :ios => "9.0", :osx => "10.14" }
+  s.platforms    = { :ios => "12.0", :osx => "10.14" }
   s.source       = { :git => "https://github.com/robinpowered/react-native-mdm.git", :tag => "v#{s.version}" }
   s.source_files  = "ios/**/*.{h,m}"
   s.dependency 'React'