update release notes, releasing 1.1.0

Author: tedder

HISTORY.md

@@ -1,14 +1,15 @@
-1.1.0 (2021-TODO)
+1.1.0 (2021-05-21)
 =========
 
 **New features**
 
 - query string ordering has been fixed. Documented in #21, fixed in #23. Thanks @zen4ever.
 - test for spaces before calling shlex on them in `amz_norm_whitespace`. shlex doesn't like to split whitespace on a string without whitespace, taking several orders of magnitude longer to parse through it. #35, thanks @noamkush.
+- added `refreshable_credentials`, see #37, thanks @teemuy.
 
 **Package changes**
 
-- none
+- Removed python2.7 support. Usage of py2.7 is not supported. `Requires-Python` will be set to py3.3+ in the next minor release.
 
 **Tests**