v0.2.0-M4

Minor Updates for upstream http4s. Mostly just library maintenance and upstream dependency bumps.

Fixes:

• Fixes for doobie documentation #77
• Microsite Publication and CI Fix #81

Upgrades:

• circe 0.11.1
• http4s 0.20.0-M5
• specs2 4.3.6

Plugins:

• sbt-release