Add minifyCSS option to html-minifier

Signed-off-by: Fred Boniface <fred@fjla.uk>

src/utils/auth.utils.js

@@ -36,7 +36,8 @@ async function generateConfirmationEmail(eml, uuid) {
         let htmlTpl = await fs.readFile('mail-templates/register.html', 'utf-8');
         let mini = minify(((htmlTpl).replace(/>>ACCESSCODE<</g, uuid)), { // Add collapse whitespace here
             removeComments: true,
-            collapseWhitespace: true
+            collapseWhitespace: true,
+            minifyCSS: true
         });
         let txtTpl = fs.readFile('mail-templates/register.txt', 'utf-8');
         return msg = {