Merge branch '2.8-maintenance'

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  Jinja2 Changelog
  ================
  
 +Version 2.9
 +-----------
 +
 +- Change cache key definition in environment. This fixes a performance
 +  regression introduced in 2.8.
 +- Added support for `generator_stop` on supported Python versions
 +  (Python 3.5 and later)
 +- Corrected a long standing issue with operator precedence of math operations
 +  not being what was expected.
 +- Added support for Python 3.6 async iterators through a new async mode.
 +
+ Version 2.8.2
+ -------------
+ 
+ (bugfix release, unreleased)
+ 
+ - Fixed a runtime error in the sandbox when attributes of async generators
+   were accessed.
+ 
  Version 2.8.1
  -------------