docs(README): Fix terminal screenshot image size

Author: pbomb

README.md

@@ -11,7 +11,7 @@ hyper-night-owl is a beautiful theme for the Hyper terminal based on the [Night
 This code for this theme is based on the [Verminal Hyper terminal theme](https://github.com/defringe/verminal).
 
 <div align="center">
-  <img height="64" width="64" alt="screenshot" src="https://raw.githubusercontent.com/pbomb/hyper-night-owl/master/other/terminal.png" />
+  <img height="363" width="640" alt="screenshot" src="https://raw.githubusercontent.com/pbomb/hyper-night-owl/master/other/terminal.png" />
 </div>
 <hr />