chore(README): add semantic-release badges (#54)

README.md

@@ -6,6 +6,8 @@ Network is a visualization to display networks and networks consisting of nodes
 
 ## Badges
 
+[![semantic-release](https://img.shields.io/badge/%20%20%F0%9F%93%A6%F0%9F%9A%80-semantic--release-e10079.svg)](https://github.com/semantic-release/semantic-release) ![npm](https://img.shields.io/npm/v/vis-network)
+
 [![GitHub contributors](https://img.shields.io/github/contributors/visjs/vis-network.svg)](https://github.com/visjs/vis-network/graphs/contributors)
 [![GitHub stars](https://img.shields.io/github/stars/visjs/vis-network.svg)](https://github.com/almende/vis/stargazers)
 
@@ -138,4 +140,4 @@ and
   * The MIT License
     http://opensource.org/licenses/MIT
 
-Vis.js may be distributed under either license.
+Vis.js may be distributed under either license.