Update to Minecraft 1.13-pre7

By: md_5 <git@md-5.net>

paper-api/src/main/java/org/bukkit/entity/PufferFish.java

@@ -0,0 +1,21 @@
+package org.bukkit.entity;
+
+/**
+ * Represents a puffer fish.
+ */
+public interface PufferFish extends Fish {
+
+    /**
+     * Returns the current puff state of this fish (i.e. how inflated it is).
+     *
+     * @return current puff state
+     */
+    int getPuffState();
+
+    /**
+     * Sets the current puff state of this fish (i.e. how inflated it is).
+     *
+     * @param state new puff state
+     */
+    void setPuffState(int state);
+}