fixes Option 2 building (react-native-maps#900)

* fixes Option 2 building

- afaik `GMSMapStyle` is not present in 2.0.x

* Update installation.md

* Update installation.md

Author: vjeranc

docs/installation.md

@@ -27,10 +27,9 @@ react-native link
 1. If you need `GoogleMaps` support also drag this folder into your project:
     - `node_modules/react-native-maps/ios/AirGoogleMaps/`
 
-### Option 2: CocoaPods -- Untested Way
-NOTE: If you actually get this to work, please open an issue to let us know.
-This is now considered the **old way** because it is untested and if it does work at all, it
-will only work if you **don't** have `use_frameworks!` in your `Podfile`
+### Option 2: CocoaPods
+This is now considered the **old way** because it will only work if you **don't** have
+`use_frameworks!` in your `Podfile`.
 
 To install using Cocoapods, simply insert the following line into your `Podfile`:
 

react-native-google-maps.podspec

@@ -12,5 +12,5 @@ Pod::Spec.new do |s|
   s.source_files  = "ios/AirGoogleMaps/**/*.{h,m}"
 
   s.dependency 'React'
-  s.dependency 'GoogleMaps', '2.0.1'
+  s.dependency 'GoogleMaps', '2.1.1'
 end