Documentation updates

README

@@ -144,12 +144,7 @@ code 1.
 As of version 0.6.0, dkimpy provides experimental support for ARC (Authenticated
 Received Chain):
 
-https://tools.ietf.org/html/draft-ietf-dmarc-arc-protocol-23
-
-This new functionality is marked experimental because the protocol is still
-under development.  There are no guarantees about API stability or
-compatibility.  Since the draft is through IETF last call, further changes are
-unlikely.
+https://tools.ietf.org/html/rfc8617
 
 In addition to arcsign and arcverify, the dkim module now provides
 arc_sign and arc_verify functions as well as an ARC class.

dkim/__init__.py

@@ -477,6 +477,7 @@ class DomainSigner(object):
   #: @param signature_algorithm: the signing algorithm to use when signing
   #: @param debug_content: log headers and body after canonicalization (default False)
   #: @param linesep: use this line seperator for folding the headers
+  #: @param timeout: number of seconds for DNS lookup timeout (default = 5)
   def __init__(self,message=None,logger=None,signature_algorithm=b'rsa-sha256',
         minkey=1024, linesep=b'\r\n', debug_content=False, timeout=5):
     self.set_message(message)