Add License end year test

Author: diegous

test/test_ruby_http_client.rb

@@ -171,4 +171,11 @@ def test_method_missing
     assert_equal({'message' => 'success'}, response.body)
     assert_equal({'headers' => 'test'}, response.headers)
   end
+
+  def test_license_date_is_updated
+    license_end_year = IO.read('LICENSE.txt').match(/Copyright \(c\) 2016-(\d{4}) SendGrid/)[1].to_i
+    current_year = Time.new.year
+
+    assert_equal(current_year, license_end_year)
+  end
 end