minor formatting fix

Author: JamesMessinger

README.md

@@ -22,24 +22,24 @@ You've got a JSON Schema with `$ref` pointers to other files and/or URLs.  Maybe
 
 ```javascript
 {
-    "definitions": {
-        "person": {
-            // references an external file
-            "$ref": "schemas/people/Bruce-Wayne.json"
-        },
-        "place": {
-            // references a sub-schema in an external file
-            "$ref": "schemas/places.yaml#/definitions/Gotham-City"
-        },
-        "thing": {
-            // references a URL
-            "$ref": "http://wayne-enterprises.com/things/batmobile"
-        },
-        "color": {
-            // references a value in an external file via an internal reference
-            "$ref": "#/definitions/thing/properties/colors/black-as-the-night"
-        }
+  "definitions": {
+    "person": {
+      // references an external file
+      "$ref": "schemas/people/Bruce-Wayne.json"
+    },
+    "place": {
+      // references a sub-schema in an external file
+      "$ref": "schemas/places.yaml#/definitions/Gotham-City"
+    },
+    "thing": {
+      // references a URL
+      "$ref": "http://wayne-enterprises.com/things/batmobile"
+    },
+    "color": {
+      // references a value in an external file via an internal reference
+      "$ref": "#/definitions/thing/properties/colors/black-as-the-night"
     }
+  }
 }
 ```