Merge pull request #264 from mixpanel/zihe-bump-ios-android-min

bump iOS to 4.3.0 and Android minSDK to 23

Author: zihejia

MixpanelReactNative.podspec

@@ -19,5 +19,5 @@ Pod::Spec.new do |s|
   s.pod_target_xcconfig = { 'DEFINES_MODULE' => 'YES' }
 
   s.dependency "React-Core"
-  s.dependency "Mixpanel-swift", '4.2.7'
+  s.dependency "Mixpanel-swift", '4.3.0'
 end