bump version to 0.13.1

update circle

ENH: Release

Merge pull request mne-tools#2890 from jaeilepp/ellipsis

Removed ellipsis in combination with time mask.

FIX: Fix docs

python-mne Debian release 0.10.1+dfsg-1

Merge pull request mne-tools#2633 from jaeilepp/maint/0.10

Py35 fix.

FIX: Changes for release

Merge pull request mne-tools#2134 from teonlamont/whats_new

FIX formatting [ci skip]

python-mne Debian release 0.8.6+dfsg-2