chore: disable ie9 due to socket.io

pemrouz · pemrouz · commit 7a84cca5e9cb · 2016-12-15T01:58:56.000Z
diff --git a/.popper.yml b/.popper.yml
@@ -15,4 +15,4 @@ browsers:
   - chrome
   - firefox
   - ie11
-  - ie9
+  # - ie9

-Original file line number
+Diff line change
   - chrome
   - firefox
   - ie11
 -  - ie9
 +  # - ie9