1.5.8

Features

• switch to pypy (22b99ac)
• add dynamic_settings table for on-the-fly ops config (e25d636, closes #165)
• Add percentage routing and migration status to user table (050ab53, closes #159)
• server: reject assertions if fxa-tokenVerified is false (e1c6f2a)

Bug Fixes

• only install cffi for CPython (6f5d2e7)
• allow pypy in docker-entrypoint.sh (757cce9)
• use cffi 1.13.2 because reasons (c283e4f)
• remember keys_changed_at when reallocating after node replacement. (ee6c065)
• deps: Update SQLAlchemy to latest version (eb2256f)