Update copyright year (#121)

Updated the year in the copyright statement in the footer

src/frontend/js/i18n/messages.json

@@ -57,7 +57,7 @@
     },
     "footer": {
       "fork-me": "Fork me on Github",
-      "copy": "&copy; 2018 <a href=\"{url}\" target=\"_blank\">jc21.com</a>.",
+      "copy": "&copy; 2019 <a href=\"{url}\" target=\"_blank\">jc21.com</a>.",
       "theme": "Theme by <a href=\"{url}\" target=\"_blank\">Tabler</a>"
     },
     "dashboard": {