Organize imports

Author: travkin79

flexmark-ext-plantuml/src/main/java/com/vladsch/flexmark/ext/plantuml/PlantUmlBlockNode.java

@@ -6,13 +6,13 @@
  */
 package com.vladsch.flexmark.ext.plantuml;
 
+import java.util.List;
+
+import org.jetbrains.annotations.NotNull;
+
 import com.vladsch.flexmark.ast.CodeBlock;
 import com.vladsch.flexmark.util.ast.BlockContent;
-import com.vladsch.flexmark.util.ast.Node;
 import com.vladsch.flexmark.util.sequence.BasedSequence;
-import org.jetbrains.annotations.NotNull;
-
-import java.util.List;
 
 /**
  * Node representing code blocks like the following