Fix Line Height

Address font size in #147.

Author: mzagaja

.github/workflows/newsletter_template.html

@@ -181,6 +181,7 @@
         text-decoration: underline;
       }
       li {
+        font-size: 16px;
         margin: 0 0 0.5rem 0;
         line-height: 1.5rem;
       }