Updating to beta 7

Author: garrettmoon

PINRemoteImage.podspec

@@ -9,7 +9,7 @@
 
 Pod::Spec.new do |s|
   s.name             = "PINRemoteImage"
-  s.version          = "3.0.0-beta.6"
+  s.version          = "3.0.0-beta.7"
   s.summary          = "A thread safe, performant, feature rich image fetcher"
   s.homepage         = "https://github.com/pinterest/PINRemoteImage"
   s.license          = 'Apache 2.0'