Update deprecated icon

Update deprecated icon

diff --git a/assets/javascripts/discourse/initializers/init-code-review.js.es6 b/assets/javascripts/discourse/initializers/init-code-review.js.es6
index 387c357..e4ab75a 100644
--- a/assets/javascripts/discourse/initializers/init-code-review.js.es6
+++ b/assets/javascripts/discourse/initializers/init-code-review.js.es6
@@ -99,7 +99,7 @@ function initialize(api) {
 
   api.registerTopicFooterButton({
     id: "followup",
-    icon: "clock-o",
+    icon: "far-clock",
     priority: 250,
     label: "code_review.followup.label",
     title: "code_review.followup.title",

GitHub sha: 54f66564