update readme

Author: hackw

CHANGELOG.md

@@ -1,4 +1,7 @@
-0.8.6-stable:
+v.0.8.7-stable:
+just update readme.
+
+v0.8.6-stable:
 The first version published to pub.dev.
 
 The following functions are supported:

README.md

@@ -79,12 +79,12 @@ dependencies:
   flutter_constraintlayout:
     git:
       url: 'https://github.com/hackware1993/Flutter-ConstraintLayout.git'
-      ref: 'v0.8.6-stable'
+      ref: 'v0.8.7-stable'
 ```
 
 ```yaml
 dependencies:
-  flutter_constraintlayout: ^0.8.6-stable
+  flutter_constraintlayout: ^0.8.7-stable
 ```
 
 ```dart