Bump to 2.19.4.

portlint.pl

@@ -50,7 +50,7 @@ $portdir = '.';
 # version variables
 my $major = 2;
 my $minor = 19;
-my $micro = 3;
+my $micro = 4;
 
 # default setting - for FreeBSD
 my $portsdir = '/usr/ports';