Update dnsplug for DNS Python (dns) 2.0 compatibility (LP: #1888583)

ChangeLog

@@ -5,6 +5,7 @@ Version 1.1
       verification of multiple signatures in a single message
     - Correct dkim.verify processing to avoid errors when verifying messages
       with no DKIM signatures
+    - Update dnsplug for DNS Python (dns) 2.0 compatibility (LP: #1888583)
 
 2019-12-31 Version 1.0.2
     - dknewkey: On posix operating systems set file permissions to 600 for

dkim/dnsplug.py

@@ -31,7 +31,7 @@ def get_txt_dnspython(name, timeout=5):
       a = dns.resolver.query(name, dns.rdatatype.TXT,raise_on_no_answer=False, lifetime=timeout)
       for r in a.response.answer:
           if r.rdtype == dns.rdatatype.TXT:
-              return b"".join(r.items[0].strings)
+              return b"".join(list(r.items)[0].strings)
     except dns.resolver.NXDOMAIN: pass
     return None