## `whereYear`
此方法用于指定查詢年數據
## 示例：
>[info] 查詢今年注冊的用戶
~~~
db.name('user').whereYear('addtime').select()
~~~
>[info] 查詢去年注冊的用戶
~~~
db.name('user').whereYear('addtime', 'last year').select()
~~~
>[info] 查詢2019年注冊的用戶
~~~
db.name('user').whereYear('addtime', 2019).select()
~~~
>[danger] `addtime` 必須是時間字段
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