v0.12.25

Bug Fixes

• client: coerce HTTP_2 requests to HTTP_11 (3a6080b1, closes #1770)
• http2: send INTERNAL_ERROR when user's Service errors (8f926a0d)

Features

• error: implement Error::source when available (4cf22dfa, closes #1768)
• http2: Add window size config options for Client and Server (7dcd4618, closes #1771)
• server: add http2_max_concurrent_streams builder option (cbae4294, closes #1772)
• service:
  • add poll_ready to Service and MakeService (#1767) (0bf30ccc)
  • allow FnMut with service_fn (877606d5)