Merge pull request 'fix typo in comment' (#1) from EmaMaker/rivet:typo into master

Reviewed-on: http://git.alemauri.eu/alema/rivet/pulls/1

rivet.sh

@@ -240,7 +240,7 @@ while IFS="" read -r file; do
 	mv "$tmpsed" "$file"
 done
 
-# Prepate the header
+# Prepare the header
 if ! [ "$SKIP_HEADER" ]; then
 	tmphead="$(mktemp)"
 	cp "$headerfile" "$tmphead"