work on vue-easy-dnd 1.22 lib include instructions

amd/src/vue-easy-dnd/readme-moodle.txt

@@ -1,13 +1,14 @@
 Instructions for downloading and integrating vue-easy-dnd
 
-1. download vue-easy-dnd distribusion throuhg npm
+(Unfortunately we cannot use the latest version, since that requires vue3 support, and bootstrap-vue isn't there yet...)
-   npm install vue-easy-dnd@
+
+1. download vue-easy-dnd distribusion throuhg npm 
+   npm install vue-easy-dnd@1.22.0
 
 2. Copy node_modules/vue-easy-dnd/dist/vue-easy-dnd.esm.js to amd/src/vue-easy-dnd
 
-3. Change import statement 
+3. Change import statements to
-   ... from 'vue'; 
+   import './reflect-metadata';
-   into
+   import { Vue, Component, Prop } from './vue-property-decorator';
-   ... from '../vue/vue';
 
 4. add /* eslint-disable */ to top of file