fix: should use rc-calendar@7.1.0

components/upload/demo/drag.md

@@ -1,6 +1,6 @@
 ---
 order: 3
-title: 
+title:
   zh-CN: 拖拽上传
   en-US: Upload files by dragging and dropping
 ---

package.json

@@ -42,7 +42,7 @@
     "object-assign": "~4.1.0",
     "omit.js": "^0.1.0",
     "rc-animate": "~2.3.0",
-    "rc-calendar": "~7.0.3",
+    "rc-calendar": "~7.1.0",
     "rc-cascader": "~0.10.1",
     "rc-checkbox": "~1.4.0",
     "rc-collapse": "~1.6.4",