Fix TextAttributes differ

lib/attributes.js

@@ -112,13 +112,11 @@ const TextAttributes = {
     font: {
         diff: fontDiffer
     },
-    textAnchor: true,
-    textDecoration: true,
     deltaX: arrayDiffer,
     deltaY: arrayDiffer,
     rotate: arrayDiffer,
-    positionX: true,
-    positionY: true,
+    positionX: arrayDiffer,
+    positionY: arrayDiffer,
     ...RenderableAttributes
 };