Issue #16329: Add .webm to mimetypes.types_map

Patch by Giampaolo Rodola'.

diff --cc Misc/NEWS
index da10aeb444590a8d4efd313619ffc4c661c3148a,676f37e7e76b4db574867f7e35e60aa4eabe3253..2bb63966bc2eef0b4ae80e31fa4eca5232085f53
--- 1/Misc/NEWS
--- 2/Misc/NEWS
+++ b/Misc/NEWS
@@@ -237,14 -98,11 +237,16 @@@ Core and Builtin
  Library
  -------
  
+ - Issue #16329: Add .webm to mimetypes.types_map.  Patch by Giampaolo Rodola'.
+ 
  - Issue #13952: Add .csv to mimetypes.types_map.  Patch by Geoff Wilson.
  
 +- Issue #26587: the site module now allows .pth files to specify files to be
 +  added to sys.path (e.g. zip files).
 +
 +- Issue #25609: Introduce contextlib.AbstractContextManager and
 +  typing.ContextManager.
 +
  - Issue #26709: Fixed Y2038 problem in loading binary PLists.
  
  - Issue #23735: Handle terminal resizing with Readline 6.3+ by installing our