message: [bugfix] Uploader: can not upload pic in android
diff: <template>
  - <div class="van-uploader">
  + <div :class="b()">
  <slot />
  <input
  + v-bind="$attrs"
  ref="input"
  type="file"
  - class="van-uploader__input"
  - v-bind="$attrs"
  + :class="b('input')"
  + :accept="accept"
  :disabled="disabled"
  @change="onChange"
  >
  @@ -24,6 +25,10 @@ export default create({
  disabled: Boolean,
  beforeRead: Function,
  afterRead: Function,
  + accept: {
  + type: String,
  + default: 'image/*'
  + },
  resultType: {
  type: String,
  default: 'dataUrl'
  