[ios] Update changelog and podspecs for 4.2.0-alpha.1

platform/ios/CHANGELOG.md

@@ -2,6 +2,16 @@
 
 Mapbox welcomes participation and contributions from everyone. Please read [CONTRIBUTING.md](../../CONTRIBUTING.md) to get started.
 
+## 4.2.0
+
+### Styles and rendering
+
+* Added an `MGLRasterStyleLayer.rasterResamplingMode` property for configuring how raster style layers are overscaled. ([#12176](https://github.com/mapbox/mapbox-gl-native/pull/12176))
+
+### Networking and storage
+
+* Improved caching performance. ([#12072](https://github.com/mapbox/mapbox-gl-native/pull/12072))
+
 ## 4.0.3 - June 22, 2018
 
 * Fixed a crash in `-[MGLStyle localizeLabelsIntoLocale:]` on iOS 9._x_. ([#12123](https://github.com/mapbox/mapbox-gl-native/pull/12123))
@@ -33,7 +43,7 @@ Mapbox welcomes participation and contributions from everyone. Please read [CONT
 * Fixed a crash that could occur when reusing `MGLMapSnapshotter` or using multiple snapshotters at the same time. ([#11831](https://github.com/mapbox/mapbox-gl-native/pull/11831))
 * Fixed an issue where an empty `MGLFeature` array caused high CPU utilization. ([#11985](https://github.com/mapbox/mapbox-gl-native/pull/11985))
 * Improved offline download performance. ([#11284](https://github.com/mapbox/mapbox-gl-native/pull/11284))
-* Fixed an issue that caused -[MGLMapView visibleFeaturesAtPoint:] to return an empty array when adding or removing features. ([#12076](https://github.com/mapbox/mapbox-gl-native/pull/12076))
+* Fixed an issue that caused `-[MGLMapView visibleFeaturesAtPoint:]` to return an empty array when adding or removing features. ([#12076](https://github.com/mapbox/mapbox-gl-native/pull/12076))
 * Improved application launch performance. ([#11784](https://github.com/mapbox/mapbox-gl-native/pull/11784))
 
 ## 4.0.2 - May 29, 2018

platform/ios/Mapbox-iOS-SDK-nightly-dynamic.podspec

@@ -1,6 +1,6 @@
 Pod::Spec.new do |m|
 
-  version = '4.1.0'
+  version = '4.2.0-alpha.1'
 
   m.name    = 'Mapbox-iOS-SDK-nightly-dynamic'
   m.version = "#{version}-nightly"

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

@@ -1,6 +1,6 @@
 Pod::Spec.new do |m|
 
-  version = '4.1.0'
+  version = '4.2.0-alpha.1'
 
   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 = '4.1.0'
+  version = '4.2.0-alpha.1'
 
   m.name    = 'Mapbox-iOS-SDK'
   m.version = version