[ios] Updated podspecs and changelog for v3.5.3 (#8870)

platform/ios/CHANGELOG.md

@@ -2,6 +2,9 @@
 
 Mapbox welcomes participation and contributions from everyone. Please read [CONTRIBUTING.md](../../CONTRIBUTING.md) to get started.
 
+## 3.5.3 - May 2, 2017
+* Fixed an issue that prevented the attribution `UIAlertController` from showing in modal hierarchies. ([#8837](https://github.com/mapbox/mapbox-gl-native/pull/8837))
+
 ## 3.5.2 - April 7, 2017
 
 * Fixed an issue that caused a crash when the user location annotation was presenting a callout view and the map was moved. ([#8686](https://github.com/mapbox/mapbox-gl-native/pull/8686))

platform/ios/Mapbox-iOS-SDK-symbols.podspec

@@ -1,6 +1,6 @@
 Pod::Spec.new do |m|
 
-  version = '3.5.2'
+  version = '3.5.3'
 
   m.name    = 'Mapbox-iOS-SDK-symbols'
   m.version = "#{version}-symbols"

platform/ios/Mapbox-iOS-SDK.podspec

@@ -1,6 +1,6 @@
 Pod::Spec.new do |m|
 
-  version = '3.5.2'
+  version = '3.5.3'
 
   m.name    = 'Mapbox-iOS-SDK'
   m.version = version