Offer the possibility to define version compatibility from plugins

doc/plugin-registration.markdown

@@ -71,6 +71,15 @@ class Plugin extends Base
     {
         $this->template->hook->attach('template:layout:head', 'theme:layout/head');
     }
+
+    public function getCompatibleVersion()
+    {
+        // Examples:
+        // >=1.0.37
+        // <1.0.37
+        // <=1.0.37
+        return '1.0.37';
+    }
 }
 ```
 
@@ -93,6 +102,7 @@ Available methods from `Kanboard\Core\Plugin\Base`:
 - `getPluginHomepage()`: Should return plugin Homepage (link)
 - `setContentSecurityPolicy(array $rules)`: Override default HTTP CSP rules
 - `onStartup()`: If present, this method is executed automatically when the event "app.bootstrap" is triggered
+- `getCompatibleVersion()`: You may want to specify the Kanboard version compatible with the plugin
 
 Your plugin registration class can also inherit from Kanboard\Core\Base, that way you can access all classes and methods of Kanboard easily.