add assembly

build.sbt

@@ -61,4 +61,8 @@ scalacOptions in ThisBuild ++= Seq(
 )
 
 mainClass in assembly := Some("Main")
-assemblyJarName in assembly := s"tryFlink.jar"
+
+assemblyMergeStrategy in assembly := {
+  case PathList("META-INF", xs @ _*) => MergeStrategy.discard
+  case x => MergeStrategy.first
+}