Add nu-cmd-lang to nu_release.nu (nushell#411)

We need to reflect the cratification of `nu-command`

Author: sholderbach

make_release/nu_release.nu

@@ -20,6 +20,7 @@ let subcrates_wave_1 = [
 ]
 
 let subcrates_wave_2 = [
+    nu-cmd-lang,
     nu-command,
 ]