Update sbt.plugin.zsh (#6930)

plugins/sbt/sbt.plugin.zsh

@@ -7,6 +7,7 @@
  
 # aliases - mnemonic: prefix is 'sb'
 alias sbc='sbt compile'
+alias sbcc='sbt clean compile'
 alias sbco='sbt console'
 alias sbcq='sbt console-quick'
 alias sbcl='sbt clean'