fix(api): append auth info as head fields for appSync realtime handshake request #367

Job	Run time
Build Amplify Swift for watchOS / Build Amplify-Build \| watchOS	9m 48s
Build Amplify Swift for tvOS / Build Amplify-Build \| tvOS	9m 14s
Build Amplify Swift for macOS / Build Amplify-Build \| macOS	9m 34s
Build Amplify Swift for iOS / Build Amplify-Build \| iOS	10m 51s
Confirm Passing Build Steps	1s
	39m 28s

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