replace deprecated renderer (text -> plain)

app/controllers/pings_controller.rb

@@ -1,5 +1,5 @@
 class PingsController < ApplicationController
   def show
-    render :text => "pong"
+    render :plain => "pong"
   end
 end

app/controllers/profile_controller.rb

@@ -60,7 +60,7 @@ def user_id
       user = User.get_user(params[:name])
       response = user.uid if user.present?
     end
-    render text: response
+    render plain: response
   end
 
   def download_vpn
@@ -90,15 +90,15 @@ def download_vpn_for_user
   def authenticate
     response = User.authenticate params
     if response
-      render text: 0
+      render plain: 0
     else
-      render text: 1
+      render plain: 1
     end
   end
 
   def authenticate_ms_chap
     response = User.ms_chap_auth params
-    render text: response
+    render plain: response
   end
 
 
@@ -124,9 +124,9 @@ def authenticate_cas
   def authenticate_pam
     response = User.authenticate_pam params
     if response
-      render text: 0
+      render plain: 0
     else
-      render text: 1
+      render plain: 1
     end
   end
 
@@ -135,12 +135,12 @@ def verify
     if token
       response = User.verify params
       if response
-        render text: 0
+        render plain: 0
       else
-        render text: 1
+        render plain: 1
       end
     else
-      render text: 1
+      render plain: 1
     end
   end
 
@@ -196,7 +196,7 @@ def public_key
     public_key = ''
     @user = User.get_user(params[:name])
     public_key = @user.public_key if @user.present?
-    render text: public_key
+    render plain: public_key
   end
 
   def user

app/controllers/users/omniauth_callbacks_controller.rb

@@ -7,7 +7,7 @@ def google_oauth2
     domain = data['info']['email'].split('@').last
 
     unless User.valid_domain? domain
-      return render text: 'Your domain is unauthorized', status: :unauthorized
+      return render plain: 'Your domain is unauthorized', status: :unauthorized
     end
     @user = User.create_user(data.info['name'], data.info['email'])