[Rakefile] Don't update repos in order to speed up examples.

Rakefile

@@ -265,7 +265,7 @@ namespace :examples do
       puts
       Dir.chdir(example.to_s) do
         sh "rm -rf Pods DerivedData"
-        sh "#{'../../bin/' unless ENV['FROM_GEM']}pod install --verbose"
+        sh "#{'../../bin/' unless ENV['FROM_GEM']}pod install --verbose --no-update"
         command = "xcodebuild -workspace '#{example.basename}.xcworkspace' -scheme '#{example.basename}'"
         if (example + 'Podfile').read.include?('platform :ios')
           # Specifically build against the simulator SDK so we don't have to deal with code signing.