fix version history - Fails to generate info for rust image (devcontainers#216)

* test

* remove rls

* revert unwanted changes

Author: samruddhikhandale

build/README.md

@@ -376,7 +376,6 @@ For example:
 
 ```json
 "cargo": {
-    "rls": null,
     "rustfmt": null,
     "rust-analysis": "rustc --version",
     "rust-src": "rustc --version",

src/rust/manifest.json

@@ -42,7 +42,6 @@
 			"Oh My Zsh!": "/home/vscode/.oh-my-zsh"
 		},
 		"cargo": {
-			"rls": null,
 			"rustfmt": null,
 			"rust-analysis": "rustc --version",
 			"rust-src": "rustc --version",