fix missing quote

Author: bahmutov

netlify.toml

@@ -1,7 +1,7 @@
 # WARNING ⚠️: this is a Netlify file with local Cypress plugin
 # so it might look quite different from the user's Netlify configuration
 [build]
-command = "echo 'Netlify build command ..."
+command = "echo 'Netlify build command ...'"
 publish = "public"
   [build.environment]
   CI = "1"