releasenotes: make the import of fuzzywuzzy optional
If fuzzywuzzy is note present, we will not be having the capability to merge
existing releasenotes with the new releasenotes on the similarity basis.
The merging will still work good for exact same releasenotes entries.
Differential Revision: https://phab.mercurial-scm.org/D1096
Mercurial
=========
Mercurial is a fast, easy to use, distributed revision control tool
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$ make # see install targets
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$ hg debuginstall # sanity-check setup
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