c.f. commit 7cbca9f60f
c.f. commit 398283a8db3177b1ae122e5b9d6a9d623cf9106f
[Dayone] Skip failing tests on Travis
Travis sets the timezone to UTC, which causes many tests to fail
fstring wip
Run pyupgrade
fix broken pyupgrade fstring
run pyupgrade on plugin dir
fixup! remove py2 remnants and use mocks in tests
small print bugfix
The file=sys.stderr was part of the format(), so an error got printed to
stdout
Drop use of codecs package
Use builtins.open() instead
fixup! remove py2 remnants and use mocks in tests