Make podspec iOS only.

Author: samvermette

SVGeocoder.podspec

@@ -2,7 +2,8 @@ Pod::Spec.new do |s|
     s.name     = 'SVGeocoder'
     s.version  = '0.1'
     s.license  = 'MIT'
-    s.summary  = 'Simple Cocoa wrapper for the Google Geocoding Service'
+    s.platform = :ios
+    s.summary  = 'Simple Cocoa wrapper for the Google Geocoding Service.'
     s.homepage = 'https://github.com/samvermette/SVGeocoder'
     s.author   = { 'Sam Vermette' => 'hello@samvermette.com' }
     s.source   = { :git => 'https://github.com/samvermette/SVGeocoder.git', :tag => s.version.to_s }