v1.5.0

• Adapters - internally, most (all?) adapters now inherit from a base Adapter class
• Adapters - adapter configuration is now accessed via a config method on
  each adapter - see the code for examples. This shouldn't affect
  users unless they were directly modifying adapters' attributes.
• Redis - fix deprecation warnings for Redis 4.6+ multi/pipelined handling (#215)
• Mongo - slight improvement to error handling