create jar 0.3.0

Author: YingxuH

build.gradle

@@ -35,7 +35,7 @@ test {
 
 shadowJar {
     archiveBaseName = "duke"
-    archiveVersion = "0.2.1"
+    archiveVersion = "0.3.0"
     archiveClassifier = null
     archiveAppendix = null
 }