Formally release version 0.2.1 of the spec

Change-Id: Ia1bce45d7699a13ac299b38f3bd8fd94f0558e4f
diff --git a/conf.py b/conf.py
index e302c33..123685b 100644
--- a/conf.py
+++ b/conf.py
@@ -41,16 +41,16 @@
 
 # General information about the project.
 project = u'NDN Packet Format Specification'
-copyright = u'2013-2016, NDN Project Team'
+copyright = u'2013-2017, NDN Project Team'
 
 # The version info for the project you're documenting, acts as replacement for
 # |version| and |release|, also used in various other places throughout the
 # built documents.
 #
 # The short X.Y version.
-version = '0.2-2'
+version = '0.2.1'
 # The full version, including alpha/beta/rc tags.
-release = '0.2-2'
+release = '0.2.1'
 
 # The language for content autogenerated by Sphinx. Refer to documentation
 # for a list of supported languages.