update readme w/ python 3 support, and mention where to find python 2

README.md

@@ -6,9 +6,12 @@ uses a profile/subset of ASN.1.  This library is not designed to be a
 general ASN.1 parser, but designed to be super simple to use, and
 secure.
 
+This library support Python 3.  The git repo has a branch, python2
+that maintains the latest support for Python 2.
+
 The following python types are supported: bool, int (and long), bytes,
-null (as None), float, unicode, datetime, list, set and dict.  If you
-need to serialize other types/instances, a coerce function maybe
+null (as None), float, unicode (aka str), datetime, list, set and dict.
+If you need to serialize other types/instances, a coerce function maybe
 provided which is required to return the above string and an object
 implementing the correct methods.  See the ASN1Coder's __init__
 method's doc string for more information.
@@ -16,7 +19,7 @@ method's doc string for more information.
 ASN.1 has a number of different types of strings, but only UTF8String
 is used by this library.  In order to support dict types, it uses the
 Private Constructed type 0.  The contents are pairs of key value objects.
-bytes (aka str in Python 2) is mapped to the octet string type.  The
-minimal encoding is used so that the same data will be encoded as the
-same string, similar to the ASN.1 DER encoding.  The class ASN1Coder
-is available if the dict support is required to not be present.
+bytes is mapped to the octet string type.  The minimal encoding is used
+so that the same data will be encoded as the same string, similar to the
+ASN.1 DER encoding.  The class ASN1Coder is available if the dict support
+is required to not be present.