add css-will-chage-1 rewrite rule

Author: Peter Linss

.htaccess

@@ -169,6 +169,7 @@ RewriteRule ^css-transitions-1/(.*)$ css-transitions/$1
 RewriteRule ^css-ui-3/(.*)$ css-ui/$1
 RewriteRule ^css-values-3/(.*)$ css-values/$1
 RewriteRule ^css-variables-1/(.*)$ css-variables/$1
+RewriteRule ^css-will-change-1/(.*)$ css-will-change/$1
 RewriteRule ^css-writing-modes-3/(.*)$ css-writing-modes/$1
 
 RewriteRule ^cssom-1/(.*)$ cssom/$1