fix(framework): base64 encoded response were not being decoded #163

Job	Run time
examples (16.x, not_stringified_body)	39s
examples (16.x, print_event_context)	20s
examples (16.x, stringified_body)	34s
examples (16.x, upload_file_multipart)	24s
examples (16.x, with_callback)	24s
examples (16.x, with_event_components)	44s
examples (16.x, with_http_get)	32s
examples (16.x, with_http_post)	24s
examples (16.x, with_object)	40s
examples (16.x, with_promise)	41s
examples (18.x, not_stringified_body)	43s
examples (18.x, print_event_context)	38s
examples (18.x, stringified_body)	32s
examples (18.x, upload_file_multipart)	20s
examples (18.x, with_callback)	23s
examples (18.x, with_event_components)	24s
examples (18.x, with_http_get)	21s
examples (18.x, with_http_post)	31s
examples (18.x, with_object)	24s
examples (18.x, with_promise)	21s
	9m 59s

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