Pin aws-sdk to '~> 2.6.32' for CodeDeploy
Pin aws-sdk to '~> 2.6.32' for CodeDeploy

aws-sdk 3.0.0.rc1 has incorrect dependency.
See https://github.com/aws/aws-sdk-ruby/issues/1356

testfairy/dpl,testfairy/dpl,travis-ci/dpl,pengsrc/dpl,travis-ci/dpl,computology/dpl,testfairy/dpl,travis-ci/dpl