v0.17.0

• New:
  • The default request body encoder EncodeData supports to encode the request body to application/x-www-form-urlencoded.
  • Add the method ReqBody for Response to return the original request body.
• Fixed:
  • Fix a panic when failing to new http.Request.
  • Fix the request body buffer bug.
  • Retract the version v0.16.0.