Fix failed tests due to typo: sponser

Author: yasulab

app/assets/stylesheets/custom.scss

@@ -37,6 +37,7 @@ div #README{
 .snsb iframe {
     margin: 0 !important;
 }
+  
 .sponsors_logo {
     ul{
         padding: 0;

test/integration/top_test.rb

@@ -2,8 +2,8 @@
 require 'test_helper'
 
 class Toptest < ActionDispatch::IntegrationTest
-  test "Sponserd link should be exist" do
+  test "Sponser links should be exist" do
       get "/"
-      assert_select 'section.sponsers_logo a[href]',count:4
+      assert_select 'section.sponsors_logo a[href]', count:4
   end
 end