Update bower dependencies, fix redraw regression

- In Mithril, `finally` has been removed from promise objects as it is not part of the ES spec. See https://gist.github.com/jish/e9bcd75e391a2b21206b for info on the substitute.
- Fix a regression introduced in e5a7013 which broke some redraws

js/forum/src/components/UserBio.js

@@ -91,10 +91,12 @@ export default class UserBio extends Component {
     if (user.bio() !== value) {
       this.loading = true;
 
-      user.save({bio: value}).finally(() => {
-        this.loading = false;
-        m.redraw();
-      });
+      user.save({bio: value})
+        .catch(() => {})
+        .then(() => {
+          this.loading = false;
+          m.redraw();
+        });
     }
 
     this.editing = false;