rtmp-services: Update Twitch ingests

You should really auto-update these lists from Twitch API.

Closes jp9000/obs-studio#440

plugins/rtmp-services/data/services.json

@@ -54,6 +54,14 @@
                 "name": "EU: Stockholm, SE",
                 "url": "rtmp://live-arn.twitch.tv/app"
             },
+            {
+                "name": "South America: Rio de Janeiro, Brazil",
+                "url": "rtmp://live-gig.twitch.tv/app"
+            },
+            {
+                "name": "South America: Sao Paulo, Brazil",
+                "url": "rtmp://live-gru.twitch.tv/app"
+            },
             {
                 "name": "US Central: Dallas, TX",
                 "url": "rtmp://live-dfw.twitch.tv/app"