fix: propTypes and demo dark theme

Author: wwayne

README.md

@@ -2,7 +2,7 @@
 
 [![Version](http://img.shields.io/npm/v/react-nice-avatar.svg)](https://www.npmjs.org/package/react-nice-avatar)
 [![npm download][download-image]][download-url]
-[![Build Status](https://travis-ci.org/chilllab/react-nice-avatar.svg?branch=main)](https://travis-ci.org/chilllab/react-nice-avatar)
+[![Build Status](https://travis-ci.com/chilllab/react-nice-avatar.svg?branch=main)](https://travis-ci.org/chilllab/react-nice-avatar)
 [![Netlify Status](https://api.netlify.com/api/v1/badges/df23baf6-daac-4ce5-a0b6-5baade2cb822/deploy-status)](https://app.netlify.com/sites/gracious-turing-db4aa3/deploys)
 
 [download-image]: https://img.shields.io/npm/dm/react-nice-avatar.svg?style=flat-square

demo/app.scss

@@ -314,6 +314,7 @@ $headerHeight: 6rem;
     position: relative;
     top: -3rem;
     margin: 3rem 4rem;
+    background: #fff;
     &.dark {
       background: #222;
       .applicationHeader {
@@ -463,7 +464,4 @@ $headerHeight: 6rem;
       }
     }
   }
-  .application {
-    background-color: #fff;
-  }
 }