PEP 566: More updates (#547)

* PEP 566: Convert hyphens to underscores

* PEP 566: Update metadata version number

* PEP 566: Update acknowledgements

pep-0566.txt

@@ -1,5 +1,5 @@
 PEP: 566
-Title: Metadata for Python Software Packages 1.3
+Title: Metadata for Python Software Packages 2.1
 Version: $Revision$
 Last-Modified: $Date$
 Author: Dustin Ingram <di@di.codes>
@@ -17,7 +17,7 @@ Replaces: 345
 Abstract
 ========
 
-This PEP describes the changes between versions 1.2 and 1.3 of the core
+This PEP describes the changes between versions 1.2 and 2.1 of the core
 metadata specification for Python packages. Version 1.2 is specified in PEP
 345.
 
@@ -36,7 +36,7 @@ PKG-INFO file.  Other fields may only occur once in a PKG-INFO file.  Fields
 marked with "(optional)" are not required to appear in a valid PKG-INFO file;
 all other fields must be present.
 
-New in Version 1.3
+New in Version 2.1
 ------------------
 
 Description-Content-Type (optional)
@@ -72,7 +72,7 @@ environment markers which use extras.
 The full specification for this field is defined in the `Core Metadata
 Specification`_.
 
-Changed in Version 1.3
+Changed in Version 2.1
 ----------------------
 
 Name
@@ -118,8 +118,8 @@ as follows:
 
 #. The original key-value format should be read with
    ``email.parser.HeaderParser``;
-#. All transformed keys should be reduced to lower case, but otherwise should
-   retain all other characters;
+#. All transformed keys should be reduced to lower case. Hyphens should be
+   replaced with underscores, but otherwise should retain all other characters;
 #. The transformed value for any field marked with "(Multiple-use") should be a
    single list containing all the original values for the given key;
 #. The ``Keywords`` field should be converted to a list by splitting the
@@ -129,7 +129,7 @@ as follows:
 Summary of Differences From PEP 345
 ===================================
 
-* Metadata-Version is now 1.3.
+* Metadata-Version is now 2.1.
 
 * Fields are now specified via the `Core Metadata Specification`_.
 
@@ -142,10 +142,11 @@ Summary of Differences From PEP 345
 References
 ==========
 
-This document specifies version 1.3 of the metadata format.
+This document specifies version 2.1 of the metadata format.
 Version 1.0 is specified in PEP 241.
 Version 1.1 is specified in PEP 314.
 Version 1.2 is specified in PEP 345.
+Version 2.0, while not formally accepted, was specified in PEP 426.
 
 .. _`Core Metadata Specification`:
    https://packaging.python.org/specifications/core-metadata/
@@ -158,7 +159,7 @@ This document has been placed in the public domain.
 Acknowledgements
 ================
 
-Thanks to Nick Coghlan for contributing to this PEP.
+Thanks to Nick Coghlan and Thomas Kluyver for contributing to this PEP.
 
 
 ..