feat: separate logger to stdout & stderr (#63)

src/main/kotlin/app/revanced/cli/logging/impl/DefaultCliLogger.kt

@@ -3,18 +3,26 @@ package app.revanced.cli.logging.impl
 import app.revanced.cli.command.MainCommand
 import app.revanced.cli.logging.CliLogger
 import java.util.logging.Logger
+import java.util.logging.SimpleFormatter
+import java.util.logging.StreamHandler
 
 internal class DefaultCliLogger(
-    private val logger: Logger = Logger.getLogger(MainCommand::javaClass.name)
+    private val logger: Logger = Logger.getLogger(MainCommand::javaClass.name),
+    private val errorLogger: Logger = Logger.getLogger(MainCommand::javaClass.name + "Err")
 ) : CliLogger {
+
+    init {
+        logger.useParentHandlers = false
+        logger.addHandler(StreamHandler(System.out, SimpleFormatter()))
+    }
     companion object {
         init {
             System.setProperty("java.util.logging.SimpleFormatter.format", "%4\$s: %5\$s %n")
         }
     }
 
-    override fun error(msg: String) = logger.severe(msg)
+    override fun error(msg: String) = errorLogger.severe(msg)
     override fun info(msg: String) = logger.info(msg)
     override fun trace(msg: String) = logger.finest(msg)
-    override fun warn(msg: String) = logger.warning(msg)
-}
+    override fun warn(msg: String) = errorLogger.warning(msg)
+}