removed main class we won't use

src/main/java/io/takima/temporalpractice/TemporalPracticeApplication.java

-package io.takima.temporalpractice;
-
-import org.slf4j.Logger;
-import org.slf4j.LoggerFactory;
-
-public class TemporalPracticeApplication {
-
-    private static final Logger log = LoggerFactory.getLogger(TemporalPracticeApplication.class);
-
-    public static void main(String[] args) {
-        log.info("Hello World!");
-    }
-}