fix: drop attach-form

packages/pjax/index.js

@@ -75,8 +75,6 @@ Pjax.prototype = {
 
   attachLink: require("./lib/proto/attach-link.js"),
 
-  attachForm: require("./lib/proto/attach-form.js"),
-
   forEachSelectors: function(cb, context, DOMContext) {
     return forEachSelectors.bind(this)(this.options.selectors, cb, context, DOMContext)
   },

packages/pjax/lib/proto/parse-element.js

@@ -9,13 +9,6 @@ module.exports = function(el) {
       }
       break
 
-    case "form":
-      // only attach link if el does not already have link attached
-      if (!el.hasAttribute(attrState)) {
-        this.attachForm(el)
-      }
-      break
-
     default:
       throw "Pjax can only be applied on <a> or <form> submit"
   }