Updated CONTRIBUTING.md with correct test command (#2150)

* Updated CONTRIBUTING.md with correct test command

Signed-off-by: carlosb1 <[email protected]>

* Changed test command

---------

Signed-off-by: carlosb1 <[email protected]>

Author: carlosb1

CONTRIBUTING.md

@@ -70,7 +70,7 @@ follow the conventions of [Keep A CHANGELOG][kacl].
 
 ## Testing
 
-nix has a test suite that you can run with `cargo test`. Ideally, we'd like pull
+nix has a test suite that you can run with `cargo test --all-features`. Ideally, we'd like pull
 requests to include tests where they make sense. For example, when fixing a bug,
 add a test that would have failed without the fix.