Added deprecation notice.

imports/ui/components/FormMessage.jsx

@@ -3,7 +3,11 @@ import { Accounts } from 'meteor/accounts-base';
 
 export class FormMessage extends React.Component {
   render () {
-    let { message, type, className = "message", style = {} } = this.props;
+    let { message, type, className = "message", style = {}, deprecated } = this.props;
+    if (deprecated) {
+      // Found backwords compatibility issue.
+      console.warn('You are overriding Accounts.ui.Form and using FormMessage, the use of FormMessage in Form has been depreacted in v1.3.0, update your implementation to use FormMessages: https://github.com/studiointeract/accounts-ui/#deprecations-in-v130');
+    }
     message = _.isObject(message) ? message.message : message; // If message is object, then try to get message from it
     return message ? (
       <div style={ style } 

imports/ui/components/LoginForm.jsx

@@ -911,12 +911,19 @@ export class LoginForm extends Tracker.Component {
 
   render() {
     this.oauthButtons();
+    // Backwords compatibility with v1.2.x.
+    const { messages = [] } = this.state;
+    const message = {
+      deprecated: true,
+      message: messages.map(({ message }) => message).join(', '),
+    };
     return (
       <Accounts.ui.Form
         oauthServices={this.oauthButtons()}
         fields={this.fields()} 
         buttons={this.buttons()}
         {...this.state}
+        message={message}
       />
     );
   }