Merge pull request #2588 from bdarnell/6.0b1

Set version to 6.0b1

Author: bdarnell

docs/releases/v6.0.0.rst

@@ -61,6 +61,8 @@ General changes
 
 - ``HTTPServerRequest.write`` has been removed. Use the methods of
   ``request.connection`` instead.
+- Unrecognized ``Content-Encoding`` values now log warnings only for
+  content types that we would otherwise attempt to parse.
 
 `tornado.ioloop`
 ~~~~~~~~~~~~~~~~
@@ -147,6 +149,8 @@ General changes
 
 - Pings and other messages sent while the connection is closing are
   now silently dropped instead of logging exceptions.
+- Errors raised by ``open()`` are now caught correctly when this method
+  is a coroutine.
 
 `tornado.wsgi`
 ~~~~~~~~~~~~~~

tornado/__init__.py

@@ -22,5 +22,5 @@
 # is zero for an official release, positive for a development branch,
 # or negative for a release candidate or beta (after the base version
 # number has been incremented)
-version = "6.0a1"
-version_info = (6, 0, 0, -99)
+version = "6.0b1"
+version_info = (6, 0, 0, -98)