Remove value field from io.minio.http.Method enum (#1271)

Author: Emkas

api/src/main/java/io/minio/http/Method.java

@@ -18,14 +18,9 @@
 
 /** HTTP methods. */
 public enum Method {
-  GET("GET"),
-  HEAD("HEAD"),
-  POST("POST"),
-  PUT("PUT"),
-  DELETE("DELETE");
-  private final String value;
-
-  private Method(String value) {
-    this.value = value;
-  }
+  GET,
+  HEAD,
+  POST,
+  PUT,
+  DELETE;
 }