Fixes updating of tooltip on data changes

Fixes issue #45

Author: maurice2k

src/action.js

@@ -12,7 +12,7 @@ export const tooltip = (element, props) => {
     }
   };
 
-  const config = {
+  let config = {
     ...props,
     targetElement: element
   };
@@ -101,6 +101,12 @@ export const tooltip = (element, props) => {
       if (title) {
         element.setAttribute('title', title);
       }
+    },
+    update(updatedProps) {
+      Object.assign(config, updatedProps);
+      if (component) {
+        component.$set(config);
+      }
     }
   };
 };