chore: add new line to file - nix

tests/specification/README.md

@@ -5,7 +5,6 @@
 1. `git submodule update --init` to fetch the testsuite submodule
 1. Edit the `mod.rs` file to your liking
     - This means you can include and exclude files and folders as you wish (only one of these two filters can be active at any one point)
-
     - Example:
 
 ```rs
@@ -56,4 +55,4 @@ pub fn spec_tests() {
         successful_reports, failed_reports, compile_error_reports
     );
 }
-```
+```