release 4.0.0

[yiminghe]

new

onSearch

support monitor search input

defaultValue

support defaultValue prop for select

optionLabelProp

#10

<Select optionLabelProp="label">
<Option value="heihei" labe={<i>!</i>}>haha</Option>
</Select>

filterOption

support filterOption as function

filterOption(inputValue,child):Boolean

optionFilterProp

prop of Option used as filter if filterOption is true

onSelect

support option as second parameter

onSelect(value,option)

placeholder/searchPlaceholder

#8

backspace on mutilple mode

#5