Update PEP list in 3.6 release PEP

The old list was a bit sparse, so I've updated it to cover
PEPs that are already implemented and accepted, and updated
the "Proposed" list to include a few more interesting PEPs
that seem likely to make the beta deadline.

pep-0494.txt

@@ -68,13 +68,26 @@ Release Schedule
 Features for 3.6
 ================
 
+Implemented changes for 3.6:
+
+* PEP 487, Simpler customisation of class creation
+* PEP 495, Local Time Disambiguation
+* PEP 498, Literal String Formatting
+* PEP 506, Adding A Secrets Module To The Standard Library
+
+Accepted changes for 3.6:
+
+* PEP 515, Underscores in Numeric Literals
+* PEP 519, Adding a file system path protocol
+* PEP 520, Preserving Class Attribute Definition Order
+* PEP 524, Make os.urandom() blocking on Linux (during system startup)
+
 Proposed changes for 3.6:
 
 * PEP 447, Add __getdescriptor__ method to metaclass
-* PEP 495, Local Time Disambiguation
-* PEP 498, Literal String Formatting
-* PEP 499, python -m foo should bind sys.modules['foo'] in addition
-  to sys.modules['__main__']
+* PEP 523, Adding a frame evaluation API to CPython
+* PEP 525, Asynchronous generators
+* PEP 526, Syntax for Variable and Attribute Annotations
 
 
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