Use a flat config instead of a tree. Fixes #245

Author: scottchiefbaker

diff-so-fancy

@@ -616,13 +616,13 @@ sub is_windows {
 
 # Return value is whether this is the first time they've run d-s-f
 sub check_first_run {
-	my $i   = get_git_config_hash();
+	my $i   = git_config();
 	my $ret = 0;
 
 	# If first-run is not set, or it's set to "true"
 	my $first_run     = git_config_boolean($i->{'diff-so-fancy'}->{'first-run'});
 	# See if they're previously set SOME diff-highlight colors
-	my $has_dh_colors = boolean($i->{color}->{'diff-highlight'}->{oldnormal} || $i->{color}->{'diff-highlight'}->{newnormal});
+	my $has_dh_colors = boolean($i->{'color.diff-highlight.oldnormal'} || $i->{'color.diff-highlight.newnormal'});
 
 	if (!$first_run || $has_dh_colors) {
 		return 0;