docs: add doc about 3.x

.travis.yml

@@ -5,6 +5,7 @@ sudo: false
 notifications:
   email:
   - yiminghe@gmail.com
+  - hust2012jiangkai@gmail.com
 
 node_js:
 - 6.9.1

README.md

@@ -59,6 +59,9 @@ react-native run-ios
 
 # 4.x beta docs
 
+> If you are looking for 3.x doc, please see [rmc-picker@3.x](https://github.com/react-component/m-picker/tree/3.x)
+
+
 ## Usage
 ```jsx
 <MultiPicker
@@ -111,8 +114,8 @@ react-native run-ios
 |selectedValue | current selected values | string/number |  |
 |onValueChange | fire when picker change | Function(value) |  |
 |disabled     | whether picker is disabled | bool | false
-|indicatorClassName     | className of indicator | String | 
-|indicatorStyle     | style of indicator | object | 
+|indicatorClassName     | className of indicator | String |
+|indicatorStyle     | style of indicator | object |
 
 ### Picker.Item props
 | name     | description    | type     | default      |

package.json

@@ -25,7 +25,12 @@
   "main": "./lib/index",
   "module": "./es/index",
   "config": {
-    "port": 8021
+    "port": 8021,
+    "entry": [
+      "./src/index.tsx",
+      "./assets/index.less",
+      "./assets/popup.less"
+    ]
   },
   "scripts": {
     "watch-tsc": "rc-tools run watch-tsc",