python3 incompatibility for update --comment

[evilkim]

Easily fixed, here's the patch:

$ git diff
diff --git a/jiracli/processor.py b/jiracli/processor.py
index 9559c77..93ad51b 100644
--- a/jiracli/processor.py
+++ b/jiracli/processor.py
@@ -145,7 +145,7 @@ class UpdateCommand(Command):
             )
         if self.args.issue_comment:
             self.jira.add_comment(
-                self.args.issue, self.args.issue_comment if isinstance(self.args.issue_comment, basestring) else get_text_from_editor()
+                self.args.issue, self.args.issue_comment if isinstance(self.args.issue_comment, str) else get_text_from_editor()
             )
             print_output(self.jira.format_issue(self.jira.get_issue(self.args.issue), comments_only=True))
         elif self.args.issue_priority:

Did I maybe just miss a 2to3 step during install from source?
Would a PR be preferred?