updateBootstrapping is defined but not called

Withouth overwriting the default `bootstrap.js` file, `npm install`
will fail because it tries to install the (now-removed) bootstrap-sass.

Author: michaeldyrynda

src/TachyonsPreset.php

@@ -13,6 +13,7 @@ public static function install()
     {
         static::updatePackages();
         static::updateSass();
+        static::updateBootstrapping();
         static::updateWelcomePage();
         static::removeNodeModules();
     }