Update License consistently to GPLv2 as per COPYING file
diff --git a/ProcessList.c b/ProcessList.c
index aa529d5..6ec7ce8 100644
--- a/ProcessList.c
+++ b/ProcessList.c
@@ -1,7 +1,7 @@
 /*
 htop - ProcessList.c
 (C) 2004,2005 Hisham H. Muhammad
-Released under the GNU GPL, see the COPYING file
+Released under the GNU GPLv2, see the COPYING file
 in the source distribution for its full text.
 */