Update README.md

Author: tonystar

README.md

@@ -1,21 +1,23 @@
 Bootstrap Float Label
 =====================
 
-Pure CSS implementation of Float Label pattern for Bootstrap 4 powered by [Float Label CSS-only](https://github.com/tonystar/float-label-css).
+Pure CSS implementation of Float Label pattern for Bootstrap 3 powered by [Float Label CSS-only](https://github.com/tonystar/float-label-css).
 
-<img src="https://cdn.rawgit.com/tonystar/bootstrap-float-label/aced600/bootstrap-float-label.png" width="432"/>
+[Switch to Bootstrap 4](https://github.com/tonystar/bootstrap-float-label)
+
+<img src="https://cdn.rawgit.com/tonystar/bootstrap-float-label/0ab4260/bootstrap-float-label.png" width="374"/>
 
 
 ## Demo
 
-https://codepen.io/tonystar/pen/LRdpYZ
+https://codepen.io/tonystar/pen/ALaZrV
 
 
 ## Usage
 
 Include `bootstrap-float-label.min.css`:
 ```html
-<link rel="stylesheet" href="https://cdn.rawgit.com/tonystar/bootstrap-float-label/v4.0.0/dist/bootstrap-float-label.min.css"/>
+<link rel="stylesheet" href="https://cdn.rawgit.com/tonystar/bootstrap-float-label/v3.0.0/dist/bootstrap-float-label.min.css"/>
 ```
 
 Then just add `.has-float-label` class to `.form-group`: