Fix change detection when base is a tag #78
Merged
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This PR fixes invalid assumption that base will always be a branch.
Instead it tries to determine full ref name using
git show-ref
.If ref is still not available after first fetch, then it executes fetch again with
--tags
option.It also changes behavior when no merge base is found .
Instead of returning all files as changed it performs direct comparison between two commits.
closes #77