Also update COPYRIGHT_YEAR in clientversion.h and teach update-copyrights.sh how to do it

src/clientversion.h

@@ -40,7 +40,7 @@
  * Copyright year (2009-this)
  * Todo: update this when changing our copyright comments in the source
  */
-#define COPYRIGHT_YEAR 2021
+#define COPYRIGHT_YEAR 2022
 
 #endif //HAVE_CONFIG_H
 

util/update-copyrights.sh

@@ -6,4 +6,8 @@
 # TODO: verify $1 and $2 exist
 # TODO: verify ack and xargs exist on this system
 
+# This update comments in soure code
 ack -l -i "20..-20..*Hush dev" | xargs ./util/replace.pl -$1 -$2
+
+# This updates the define which is used by C++ help output
+./util/replace.pl "COPYRIGHT_YEAR $1" "COPYRIGHT_YEAR $2" src/clientversion.h