Update THANKS.

THANKS

@@ -13,6 +13,7 @@ has been important. :-) In alphabetical order:
   - Emmanuel Blot
   - Melanie Blower
   - Martin Blumenstingl
+  - Ben Boeckel
   - Jakub Bogusz
   - Maarten Bosmans
   - Trent W. Buck
@@ -95,6 +96,7 @@ has been important. :-) In alphabetical order:
   - Stuart Shelton
   - Sebastian Andrzej Siewior
   - Brad Smith
+  - Pippijn van Steenhoven
   - Jonathan Stott
   - Dan Stromberg
   - Vincent Torri