Remove unnecessary keyword

spring-boot-devtools/src/main/java/org/springframework/boot/devtools/filewatch/ChangedFile.java

@@ -109,7 +109,7 @@ public final class ChangedFile {
 	/**
 	 * Change types.
 	 */
-	public static enum Type {
+	public enum Type {
 
 		/**
 		 * A new file has been added.

spring-boot-devtools/src/main/java/org/springframework/boot/devtools/livereload/Frame.java

@@ -107,7 +107,7 @@ class Frame {
 		return new Frame(Type.forCode(firstByte & 0x0F), payload);
 	}
 
-	public static enum Type {
+	public enum Type {
 
 		/**
 		 * Continuation frame.

spring-boot-devtools/src/main/java/org/springframework/boot/devtools/restart/FailureHandler.java

@@ -47,7 +47,7 @@ public interface FailureHandler {
 	/**
 	 * Various outcomes for the handler.
 	 */
-	public static enum Outcome {
+	enum Outcome {
 
 		/**
 		 * Abort the relaunch.

spring-boot-devtools/src/main/java/org/springframework/boot/devtools/restart/classloader/ClassLoaderFile.java

@@ -90,7 +90,7 @@ public class ClassLoaderFile implements Serializable {
 	/**
 	 * The kinds of class load files.
 	 */
-	public static enum Kind {
+	public enum Kind {
 
 		/**
 		 * The file has been added since the original JAR was created.