v0.3.16

Bug Fixes

• header:
  • make test_module of header! optional (a5ce9c59, closes #490)
  • exporting test_header! macro (2bc5a779)
• http: keep raw reason phrase in RawStatus (8cdb9d5d, closes #497)

Features

• client: add a Connection Pool (1e72a8ab, closes #363, #41)
• headers: Add If-Range header (a39735f1, closes #388)