removes stats controller spec deprecation warning

spec/controllers/admin/api/stats_controller_spec.rb

@@ -31,7 +31,7 @@ describe Admin::Api::StatsController do
 
       it "returns single events formated for working with c3.js" do
         sign_in user
-        get :show, events: "foo"
+        get :show, params: { events: "foo" }
 
         expect(response).to be_ok
 
@@ -41,7 +41,7 @@ describe Admin::Api::StatsController do
 
       it "returns combined comma separated events formated for working with c3.js" do
         sign_in user
-        get :show, events: "foo,bar"
+        get :show, params: { events: "foo,bar" }
 
         expect(response).to be_ok
 
@@ -60,7 +60,7 @@ describe Admin::Api::StatsController do
         create :visit, started_at: time_2
 
         sign_in user
-        get :show, visits: true
+        get :show, params: { visits: true }
 
         expect(response).to be_ok
 
@@ -83,7 +83,7 @@ describe Admin::Api::StatsController do
         create :visit, started_at: time_2
 
         sign_in user
-        get :show, events: "foo", visits: true
+        get :show, params: { events: "foo", visits: true }
 
         expect(response).to be_ok