v1.0.4

Add regexp responders feature.

To register a regexp responder, see:

• RegisterResponder & MockTransport.RegisterResponder with url prefixed with "=~"
• new RegisterRegexpResponder & MockTransport.RegisterRegexpResponder

And to help writing custom responders, new functions:

• GetSubmatch & MustGetSubmatch
• GetSubmatchAsFloat & MustGetSubmatchAsFloat
• GetSubmatchAsInt & MustGetSubmatchAsInt
• GetSubmatchAsUint & MustGetSubmatchAsUint

v1.0.3

• NewNotFoundResponder() stack trace reworked;
• Add Once, Times and Trace Responder methods.

v1.0.2

• Cancelable contexts now fully handled;
• NewNotFoundResponder() function added;
• Documentation fixes.

v1.0.1

• Do not call responder under lock anymore
• If several non-default clients are activated, correctly disable them
• Fix pre-go1.13 test failure
• Add ContentLength property in mocked http.Response

v1.0.0

Coz we always need a first release!