Update release type to 'rc8'

Author: FiniteSingularity

buildspec.json

@@ -42,7 +42,7 @@
     "versionMinor": 0,
     "versionPatch": 0,
     "buildNumber": 0,
-    "releaseType": "rc7",
+    "releaseType": "rc8",
     "author": "Elgato",
     "website": "https://elgato.com",
     "email": "support@elgato.com",