Apply workaround to fix httpretty with urllib>=2.3 Apply from https://github.com/PyGithub/PyGithub/pull/3102 to fix error in httpretty using urllib >= 2.3.
Increase sleep time in a treading test In Debian CI fails a test that use sleep(0.05) and in some machine apparently they don't have enough time to finished. Thanks cjwatson to noted it.
