Error creating vanish command, min was never fixed (#138)

src/dances/vanish.js

@@ -1,6 +1,6 @@
 export default (elem, value, options = {}) => {
   const max = !isNaN(options.max) ? options.max : 1
-  const min = !isNaN(options.max) ? options.max : 0
+  const min = !isNaN(options.min) ? options.min : 0
   const vanish = (max - min) * value
   if (options.reverse) {
     elem.style.opacity = max - vanish