Merge branch 'jk/cvsimport-does-not-work-with-cvsps3'

Warn people that other tools are more recommendable over
cvsimport+cvsps2 combo when doing a one-shot import, and cvsimport
will not work with cvsps3.

* jk/cvsimport-does-not-work-with-cvsps3:
  git-cvsimport.txt: cvsps-2 is deprecated

Documentation/git-cvsimport.txt

@@ -18,6 +18,12 @@ SYNOPSIS
 
 DESCRIPTION
 -----------
+*WARNING:* `git cvsimport` uses cvsps version 2, which is considered
+deprecated; it does not work with cvsps version 3 and later.  If you are
+performing a one-shot import of a CVS repository consider using
+link:http://cvs2svn.tigris.org/cvs2git.html[cvs2git] or
+link:https://github.com/BartMassey/parsecvs[parsecvs].
+
 Imports a CVS repository into git. It will either create a new
 repository, or incrementally import into an existing one.