Log Message:
Changes 1.20:
Added support for waiting for I/O using selectors other than select, improving \ 
urllib3’s behaviour with large numbers of concurrent connections. (Pull \ 
1001)
Updated the date for the system clock check. (Issue 1005)
ConnectionPools now correctly consider hostnames to be case-insensitive. (Issue 1032)
Outdated versions of PyOpenSSL now cause the PyOpenSSL contrib module to fail \ 
when it is injected, rather than at first use. (Pull 1063)
Outdated versions of cryptography now cause the PyOpenSSL contrib module to fail \ 
when it is injected, rather than at first use. (Issue 1044)
Automatically attempt to rewind a file-like body object when a request is \ 
retried or redirected. (Pull 1039)
Fix some bugs that occur when modules incautiously patch the queue module. (Pull \ 
1061)
Prevent retries from occuring on read timeouts for which the request method was \ 
not in the method whitelist. (Issue 1059)
Changed the PyOpenSSL contrib module to lazily load idna to avoid unnecessarily \ 
bloating the memory of programs that don’t need it. (Pull 1076)
Add support for IPv6 literals with zone identifiers. (Pull 1013)
Added support for socks5h:// and socks4a:// schemes when working with SOCKS \ 
proxies, and controlled remote DNS appropriately. (Issue 1035)