chore: Update TravisCI image and CocoaPods version (#398)

.travis.yml

@@ -1,5 +1,5 @@
 language: swift
-osx_image: xcode11
+osx_image: xcode11.5
 env:
   global:
   - FRAMEWORK_NAME=AWSAppSync
@@ -12,7 +12,7 @@ before_install:
   -d
 - brew update
 - brew outdated carthage || brew upgrade carthage
-- gem install cocoapods -v '1.8.4'
+- gem install cocoapods -v '1.9.3'
 before_deploy:
 - carthage build --no-skip-current
 - carthage archive $FRAMEWORK_NAME

CHANGELOG.md

@@ -8,6 +8,7 @@ also includes support for offline operations.
 ### Misc. Updates
 
 - Changed the repo's default branch to 'main'
+- Build Carthage binaries using Xcode 11.5
 
 ## 3.1.2
 

README.md

@@ -83,7 +83,7 @@ The AWS AppSync SDK for iOS enables you to access your AWS AppSync backend and p
 
 1. Now **Build** your project to start using the SDK. Whenever a new version of the SDK is released you can update by running `carthage update` and rebuilding your project to use the new features.
 
-    > Note: Currently, the AWSAppSync SDK for iOS builds the Carthage binaries using Xcode 11. To consume the pre-built binaries your Xcode version needs to be the same. Otherwise you will have to build the frameworks on your machine by passing `--no-use-binaries` flag to `carthage update` command.
+    > Note: Currently, the AWSAppSync SDK for iOS builds the Carthage binaries using Xcode 11.5. To consume the pre-built binaries your Xcode version needs to be the same. Otherwise you will have to build the frameworks on your machine by passing `--no-use-binaries` flag to `carthage update` command.
 
 1. In your source file, import the SDK using `import AWSAppSync`.