bin/sixword in sixword-0.3.1 vs bin/sixword in sixword-0.3.2

@@ -53,10 +53,14 @@
 
     opts.on('-h', '--help', 'Display this message', ' ') do
       $stderr.puts opts, ''
       exit 0
     end
+    opts.on('-v', '--version', 'Print version number', ' ') do
+      puts 'sixword ' + Sixword::VERSION
+      exit 0
+    end
 
     #
 
     opts.on('-d', '--decode', 'Decode data') do
       options[:mode] = :decode
@@ -85,10 +89,15 @@
     opts.on('-f', '--fingerprint', 'Short for --hex-style fingerprint') do
       options[:hex_style] = 'fingerprint'
     end
   end
 
-  optparse.parse!
+  begin
+    optparse.parse!
+  rescue OptionParser::InvalidOption => err
+    puts_err(err.message)
+    exit 1
+  end
 
   case ARGV.length
   when 0
     filename = '-'
   when 1