Version 3.1.1 released

This release fixes a bug with the code tag introduced in 3.1.0 which causes it to match block styles resulting in [code][left] instead of just [code].

Thanks to @berkut1 for reporting!

Full changelog:

• Fixed bug with [code] tags matching block styles resulting in output like [code][left] instead of just [code].
  – Thanks to @berkut1 for reporting.