change maxVisualPitch back to 60

Author: fuzhenn

src/map/Map.js

@@ -43,7 +43,7 @@ import SpatialReference from './spatial-reference/SpatialReference';
  * @property {Extent}  [options.maxExtent=null]         - when maxExtent is set, map will be restricted to the give max extent and bouncing back when user trying to pan ouside the extent.
  *
  * @property {Number}  [options.maxPitch=80]                    - max pitch
- * @property {Number}  [options.maxVisualPitch=56]              - the max pitch to be visual
+ * @property {Number}  [options.maxVisualPitch=60]              - the max pitch to be visual
  *
  * @property {Extent}  [options.viewHistory=true]               -  whether to record view history
  * @property {Extent}  [options.viewHistoryCount=10]            -  the count of view history record.
@@ -76,7 +76,7 @@ import SpatialReference from './spatial-reference/SpatialReference';
  * @instance
  */
 const options = {
-    'maxVisualPitch' : 56,
+    'maxVisualPitch' : 60,
     'maxPitch' : 80,
     'centerCross': false,