Add some changelog.

+ Fix ability to set timeout for urllib3 (#6286)
+ get_cookie uses w3c endpoint when compliant
+ Remove body from GET requests (#6250)
+ Fix actions pause for fraction of a second (#6300)
+ Fixed input pausing for some actions methods
+ Capabilities can be set on Options classes
+ WebElement rect method is now forward compatible for OSS
endpoints (#6355)
+ Deprecation warnings now have a stacklevel of 2
+ keep_alive can now be set on Webdriver init (#6316)
+ isDisplayed atom is now used for all w3c compliant browser,
fixing issue with Safari 12
- Ship license file