Change ReadMe Logo (#40)

* Added logo for dark mode

README.md

@@ -1,6 +1,10 @@
 <div align="center">
 
-<img src="docs/images/logo.svg" alt="drawing" width = 450/>
+    
+<h1 align="center">
+  <img width="600" src="docs/images/logo.svg#gh-light-mode-only" alt="Pynecone">
+  <img width="600" src="docs/images/logo_white.svg#gh-dark-mode-only" alt="Pynecone">
+</h1>
 
 **Build performant, customizable web apps in minutes just using Python.**
 
@@ -220,4 +224,4 @@ Pynecone is open-source and licensed under the [Apache License 2.0](LICENSE).
 
 <a href="https://github.com/picklelo"><img src="https://avatars.githubusercontent.com/u/6270214?v=4" width="50" height="50" alt=""/></a> 
 <a href="https://github.com/Alek99"><img src="https://avatars.githubusercontent.com/u/38776361?s=400&u=bd6c163fe787c2de1a26c881598e54b67e2482dd&v=4" width="50" height="50" alt=""/></a> 
-<a href="https://github.com/kbrgl"><img src="https://avatars.githubusercontent.com/u/13417496?v=4" width="50" height="50" alt=""/></a> 
+<a href="https://github.com/kbrgl"><img src="https://avatars.githubusercontent.com/u/13417496?v=4" width="50" height="50" alt=""/></a>