Prepare for 4.1.0 release (#240)

Author: mdmathias

CHANGELOG.md

@@ -1,3 +1,7 @@
+# 4.1.0
+- Fix keychain key bug ([#237](https://github.com/google/GTMAppAuth/pull/237))
+- Add privacy manifest ([#239](https://github.com/google/GTMAppAuth/pull/239))
+
 # 4.0.0
 
 - Updated `AuthSessionDelegate` method for updating error to take a completion to support async updates [#229](https://github.com/google/GTMAppAuth/pull/229)

GTMAppAuth.podspec

@@ -1,7 +1,7 @@
 Pod::Spec.new do |s|
 
   s.name          = 'GTMAppAuth'
-  s.version       = '4.0.0'
+  s.version       = '4.1.0'
   s.swift_version = '4.0'
   s.summary       = 'Authorize GTM Session Fetcher requests with AppAuth via GTMAppAuth'