channels may only be alpha, beta, eap

https://www.jetbrains.org/intellij/sdk/docs/tutorials/build_system/deployment.html#specifying-a-release-channel

Author: mythz

src/ServiceStackIDEA/build.gradle

@@ -33,6 +33,6 @@ intellij {
 
     publishPlugin {
       token jbToken
-      channel 'nightly'
+      channel 'beta'
     } 
 }