branch fix-letsencrypt created (now be42104)

[Leo Famulari]

lfam pushed a change to branch fix-letsencrypt
in repository guix.

        at  be42104   gnu: python-pyopenssl: Update to 16.0.0.

This branch includes the following new commits:

       new  96f8127   gnu: python-pytest: Update to 2.7.3.
       new  d8411d7   gnu: python-cryptography, python-cryptography-vectors: 
Update to 1.3.1.
       new  be42104   gnu: python-pyopenssl: Update to 16.0.0.

The 3 revisions listed above as "new" are entirely new to this
repository and will be described in separate emails.  The revisions
listed as "adds" were already present in the repository and have only
been added to this reference.