Security fixes
This release fixes some security issues in gem dependencies, and a few administrative changes relating to RubyMine and my new Mac.
Bump rack from 1.6.11 to 1.6.12
Bump loofah from 2.2.3 to 2.4.0
Bump rubyzip from 1.2.2 to 2.0.0
Bump puma from 3.11.0 to 3.12.2
Bump devise from 4.6.2 to 4.7.1