[improvement] Color: update base green to wechat green (#2479)

packages/radio/demo/index.vue

@@ -25,7 +25,7 @@
       <van-radio
         name="1"
         value="1"
-        checked-color="#4b0"
+        checked-color="#07c160"
         class="demo-radio-group"
       >
         {{ $t('radio') }}

packages/radio/en-US.md

@@ -43,7 +43,7 @@ export default {
 #### Custom Color
 
 ```html
-<van-radio checked-color="#4b0">Radio</van-radio>
+<van-radio checked-color="#07c160">Radio</van-radio>
 ```
 
 #### Inside a Cell

packages/radio/test/__snapshots__/demo.spec.js.snap

@@ -15,7 +15,7 @@ exports[`renders demo correctly 1`] = `
     </div>
   </div>
   <div>
-    <div class="demo-radio-group van-radio"><span class="van-radio__input"><input type="radio" value="1" checked="checked" class="van-radio__control"> <i class="van-icon van-icon-checked" style="color:#4b0;font-size:undefined;"> <!----> <!----></i></span> <span class="van-radio__label">
+    <div class="demo-radio-group van-radio"><span class="van-radio__input"><input type="radio" value="1" checked="checked" class="van-radio__control"> <i class="van-icon van-icon-checked" style="color:#07c160;font-size:undefined;"> <!----> <!----></i></span> <span class="van-radio__label">
       单选框
     </span></div>
   </div>

packages/radio/zh-CN.md

@@ -45,7 +45,7 @@ export default {
 #### 自定义颜色
 
 ```html
-<van-radio checked-color="#4b0">复选框</van-radio>
+<van-radio checked-color="#07c160">复选框</van-radio>
 ```
 
 #### 与 Cell 组件一起使用