fix codebuild-ci code to allow sourceVersion not to has prefix "pr/" #51
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WHAT
fix codebuild-ci code to allow sourceVersion not to has prefix "pr/"
WHY
According to https://docs.aws.amazon.com/codebuild/latest/userguide/build-env-ref-env-vars.html, CODEBUILD_SOURCE_VERSION doesn't has prefix "pr/" when trigger is not pull request.
And If we use codebuild as CI and CODEBUILD_SOURCE_VERSION doesn't contain "pr/" , we encounter with error "strconv.Atoi: parsing "xxxxxxxxxxx": invalid syntax " in tfnotify.
So tfnotify module should check whether sourceVersion has prefix "pr/" or not and if it doesn't ,return ci and nil before func.strconv.Atoi.