tweak readme

Author: fdncred

README.md

@@ -10,8 +10,11 @@ This [extension for VSCode](https://code.visualstudio.com/docs/introvideos/exten
 ## Screenshot (v0.5.1)
 
 With Nushell-Dark Color Theme
+
 ![Nushell script with Nushell color theme](https://raw.githubusercontent.com/nushell/vscode-nushell-lang/main/assets/051-dark.png)
+
 With Nushell-Light Color Theme
+
 ![Nushell script with VSDark+ color theme](https://raw.githubusercontent.com/nushell/vscode-nushell-lang/main/assets/051-light.png)
 
 ## Known Issues