Begin implementation of CheckStyle style checking

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

paper-api/src/main/java/org/bukkit/EntityEffect.java

@@ -153,7 +153,7 @@ public enum EntityEffect {
 
     private final byte data;
     private final Class<? extends Entity> applicable;
-    private final static Map<Byte, EntityEffect> BY_DATA = Maps.newHashMap();
+    private static final Map<Byte, EntityEffect> BY_DATA = Maps.newHashMap();
 
     EntityEffect(final int data, /*@NotNull*/ Class<? extends Entity> clazz) {
         this.data = (byte) data;