Clarify that dependsOn() does not take class names (#110)

README.md

@@ -61,6 +61,9 @@ public function fields(Request $request)
 }
 ```
 
+Method `dependsOn` takes the `name` property of the fields it depends on.
+Use the field's `attribute` value if you specified it manually.
+
 ## Options
 
 ```placeholder('Optional Placeholder') ```

src/NovaBelongsToDepend.php

@@ -80,12 +80,19 @@ public function optionsResolve($callback)
         return $this;
     }
 
-    public function dependsOn(string ...$classNames): NovaBelongsToDepend
+    /**
+     * You may depend on other NovaBelongsToDepend fields only.
+     *
+     * @param string ...$attributeNames "name" value of the fields this field
+     *                                  depends on, or their "attribute" value
+     *                                  if it is different.
+     */
+    public function dependsOn(string ...$attributeNames): NovaBelongsToDepend
     {
-        foreach ($classNames as &$value) {
+        foreach ($attributeNames as &$value) {
             $value = Str::lower($value);
         }
-        $this->dependsOn = $classNames;
+        $this->dependsOn = $attributeNames;
         return $this;
     }