Refresh contributors file

CONTRIBUTORS

@@ -37,12 +37,16 @@ Harendra Kumar <[email protected]>
 James Davidson <[email protected]>
 Jeff Fein-Worton <[email protected]>
 Jochen Keil <[email protected]>
+John Karahalis <[email protected]>
+John Whitley <[email protected]>
 Jonathan Sternberg <[email protected]>
 Julien Lecomte <[email protected]>
 Kevin Lyda <[email protected]>
 leycec <[email protected]>
+Lyderic Landry <[email protected]>
 Markus Martin <[email protected]>
 martin f. krafft <[email protected]>
+Martin Kühl <[email protected]>
 Mathias Svensson <[email protected]>
 mek-apelsin <[email protected]>
 Mert Dirik <[email protected]>