Raise error instead of unhelpful behavior for --since-tag or --due-tag #621
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Fixes #604
The --since-tag and --due-tag arguments exist to specify tags between
which the changelog should be generated. Prior to this change if these
tags do not exist then GCG continues to generate the entire changelog
which is not what the user requested. This change causes an error
informing the user that their specified tags do not exist so their
request could not be completed.
Other arguments with similar behavior such as --exclude-tags and
--exclude-tags-regex may continue to only give a warning in case the
user made a mistake, but should not error as nonexistent tags are
trivially excluded.