Fix warning about isMounted being deprecated

package.json

@@ -1,6 +1,6 @@
 {
   "name": "formsy-react",
-  "version": "0.19.4",
+  "version": "0.19.5",
   "description": "A form input builder and validator for React JS",
   "repository": {
     "type": "git",

src/main.js

@@ -394,7 +394,7 @@ Formsy.Form = createReactClass({
 
     // If there are no inputs, set state where form is ready to trigger
     // change event. New inputs might be added later
-    if (!this.inputs.length && this.isMounted()) {
+    if (!this.inputs.length) {
       this.setState({
         canChange: true
       });