Added --version flag

README.pod

@@ -167,6 +167,12 @@ filled in with capital "X" characters instead.
 
     end of test
 
+=head2 version / v
+
+Show the current version number
+
+    % highlight --version
+
 =head2 help / h
 
 Show a brief help message

lib/App/highlight.pm

@@ -47,6 +47,7 @@ sub opt_spec {
         [ 'full-line|l'       => "highlight the whole matched line"     ],
         [ 'one-color|o'       => "use only one color for all matches"   ],
         [ 'show-bad-spaces|b' => "highlight spaces at the end of lines" ],
+        [ 'version|v'         => "show version number"                  ],
         [ 'help|h'            => "display a usage message"              ],
     );
 }
@@ -65,6 +66,10 @@ sub validate_args {
         print "\n";
         exit;
     }
+    elsif ($opt->{'version'}) {
+        print $App::highlight::VERSION, "\n";
+        exit;
+    }
 
     if (!@$args && !$opt->{'show_bad_spaces'}) {
         $self->usage_error(
@@ -321,6 +326,12 @@ filled in with capital "X" characters instead.
 
     end of test
 
+=head2 version / v
+
+Show the current version number
+
+    % highlight --version
+
 =head2 help / h
 
 Show a brief help message

t/88-version.t

@@ -0,0 +1,22 @@
+use strict;
+use warnings;
+
+use File::Basename;
+use lib dirname(__FILE__);
+
+use Test::More tests => 1;
+use App::Cmd::Tester;
+use Test::AppHighlightWords;
+
+use App::highlight;
+
+## version - show version number
+{
+    my $result = test_app('App::highlight' => [ '--version' ]);
+
+    like(
+        $result->stdout,
+        qr/$App::highlight::VERSION/ms,
+        "highlight --version => $App::highlight::VERSION"
+    );
+}