COPYING: include the no-warranty clause

Makefile

@@ -1,7 +1,8 @@
 # Copyright © 2014 Kosma Moczek <kosma@cloudyourcar.com>
-# This work is free. You can redistribute it and/or modify it under the
-# terms of the Do What The Fuck You Want To Public License, Version 2,
-# as published by Sam Hocevar. See the COPYING file for more details.
+# This program is free software. It comes without any warranty, to the extent
+# permitted by applicable law. You can redistribute it and/or modify it under
+# the terms of the Do What The Fuck You Want To Public License, Version 2, as
+# published by Sam Hocevar. See the COPYING file for more details.
 
 CFLAGS = -g -Wall -Wextra -Werror
 LDFLAGS = -lcheck

example.c

@@ -1,8 +1,9 @@
 /*
  * Copyright © 2014 Kosma Moczek <kosma@cloudyourcar.com>
- * This work is free. You can redistribute it and/or modify it under the
- * terms of the Do What The Fuck You Want To Public License, Version 2,
- * as published by Sam Hocevar. See the COPYING file for more details.
+ * This program is free software. It comes without any warranty, to the extent
+ * permitted by applicable law. You can redistribute it and/or modify it under
+ * the terms of the Do What The Fuck You Want To Public License, Version 2, as
+ * published by Sam Hocevar. See the COPYING file for more details.
  */
 
 #include <stdio.h>

minmea.c

@@ -1,8 +1,9 @@
 /*
  * Copyright © 2014 Kosma Moczek <kosma@cloudyourcar.com>
- * This work is free. You can redistribute it and/or modify it under the
- * terms of the Do What The Fuck You Want To Public License, Version 2,
- * as published by Sam Hocevar. See the COPYING file for more details.
+ * This program is free software. It comes without any warranty, to the extent
+ * permitted by applicable law. You can redistribute it and/or modify it under
+ * the terms of the Do What The Fuck You Want To Public License, Version 2, as
+ * published by Sam Hocevar. See the COPYING file for more details.
  */
 
 #include "minmea.h"

minmea.h

@@ -1,8 +1,9 @@
 /*
  * Copyright © 2014 Kosma Moczek <kosma@cloudyourcar.com>
- * This work is free. You can redistribute it and/or modify it under the
- * terms of the Do What The Fuck You Want To Public License, Version 2,
- * as published by Sam Hocevar. See the COPYING file for more details.
+ * This program is free software. It comes without any warranty, to the extent
+ * permitted by applicable law. You can redistribute it and/or modify it under
+ * the terms of the Do What The Fuck You Want To Public License, Version 2, as
+ * published by Sam Hocevar. See the COPYING file for more details.
  */
 
 #ifndef MINMEA_H

tests.c

@@ -1,8 +1,9 @@
 /*
  * Copyright © 2014 Kosma Moczek <kosma@cloudyourcar.com>
- * This work is free. You can redistribute it and/or modify it under the
- * terms of the Do What The Fuck You Want To Public License, Version 2,
- * as published by Sam Hocevar. See the COPYING file for more details.
+ * This program is free software. It comes without any warranty, to the extent
+ * permitted by applicable law. You can redistribute it and/or modify it under
+ * the terms of the Do What The Fuck You Want To Public License, Version 2, as
+ * published by Sam Hocevar. See the COPYING file for more details.
  */
 
 #include <stdlib.h>