Fix typo

lexers/README.md

@@ -41,6 +41,6 @@ Instead we have to perform both steps separately:
 	+ In the regular command prompt window, the `set` command sets an environment variable for the current session: `set RECORD=true`. See [this page](https://superuser.com/questions/212150/how-to-set-env-variable-in-windows-cmd-line) for more.
 	+ In PowerShell, you can use the `$env:RECORD = 'true'` command for that. See [this article](https://mcpmag.com/articles/2019/03/28/environment-variables-in-powershell.aspx) for more.
 	+ You can also make a persistent environment variable by hand in the Windows computer settings. See [this article](https://www.computerhope.com/issues/ch000549.htm) for how.
-- When the environment variable is set, run `go tests ./lexers`.
+- When the environment variable is set, run `go test ./lexers`.
 
 Chroma will now regenerate the test files and print its results to the console window.