Code review comment for lp:~verb/duplicity/boto-min-version

I hadn't noticed it before, but the man page already reflects a boto requirement of 2.0+.

I haven't submitted any work on boto_multi, but the README said the minimum version was 2.1.1, I added it to boto_multi for consistency. In retrospect, it seems pretty unlikely that the minimum version is actually 2.1.1.

According to the release notes, 2.1.1 is a bugfix release that only affects RDS. 2.1.0 doesn't list any changes for multipart upload, either. boto_multi may only require 2.0. I'll test it with 2.0.