docs: add doc for UniqueBy function

docs/slice.md

@@ -998,7 +998,33 @@ func main() {
 
 
 
-### <span id="Union">Unique</span>
+### <span id="UniqueBy">UniqueBy</span>
+<p>Call iteratee func with every item of slice, then remove duplicated.</p>
+
+<b>Signature:</b>
+
+```go
+func UniqueBy(slice, iteratee interface{}) interface{}
+```
+<b>Example:</b>
+
+```go
+import (
+	"fmt"
+	"github.com/duke-git/lancet/slice"
+)
+
+func main() {
+	res := slice.UniqueBy([]int{1, 2, 3, 4, 5, 6}, func(val int) int {
+		return val % 4
+	})
+	fmt.Println(res) //[]int{1, 2, 3, 0}
+}
+```
+
+
+
+### <span id="Union">Union</span>
 <p>Creates a slice of unique values, in order, from all given slices. using == for equality comparisons.</p>
 
 <b>Signature:</b>

docs/slice_zh-CN.md

@@ -998,7 +998,32 @@ func main() {
 
 
 
-### <span id="Union">Unique</span>
+### <span id="UniqueBy">UniqueBy</span>
+<p>对切片的每个项目调用iteratee函数，然后删除重复的</p>
+
+<b>函数签名:</b>
+
+```go
+func UniqueBy(slice, iteratee interface{}) interface{}
+```
+<b>例子:</b>
+
+```go
+import (
+	"fmt"
+	"github.com/duke-git/lancet/slice"
+)
+
+func main() {
+	res := slice.UniqueBy([]int{1, 2, 3, 4, 5, 6}, func(val int) int {
+		return val % 4
+	})
+	fmt.Println(res) //[]int{1, 2, 3, 0}
+}
+```
+
+
+### <span id="Union">Union</span>
 <p>从所有给定的切片按顺序创建一个唯一值切片。 使用 == 进行相等比较。</p>
 
 <b>函数签名:</b>