Update readme screenshots

Author: fdncred

README.md

@@ -7,15 +7,15 @@ This [extension for VSCode](https://code.visualstudio.com/docs/introvideos/exten
 - Syntax highlighting grammar for Nushell scripts (`.nu` files)
 - Nushell theme that tries to match Nushell's coloring
 
-## Screenshot (v0.5.1)
+## Screenshot (v0.7.0)
 
-With Nushell-Dark Color Theme
+With Dark+ Color Theme
 
-![Nushell script with Nushell color theme](https://raw.githubusercontent.com/nushell/vscode-nushell-lang/main/assets/051-dark.png)
+![Nushell script with Dark+ color theme](https://raw.githubusercontent.com/nushell/vscode-nushell-lang/main/assets/070-dark.png)
 
-With Nushell-Light Color Theme
+With Light+ Color Theme
 
-![Nushell script with VSDark+ color theme](https://raw.githubusercontent.com/nushell/vscode-nushell-lang/main/assets/051-light.png)
+![Nushell script with Light+ color theme](https://raw.githubusercontent.com/nushell/vscode-nushell-lang/main/assets/070-light.png)
 
 ## Known Issues