Add uniq function

[ImShakthi]

Uniq will return the unique set of elements in the given array

API

input := []int{1,1,2,2,3,4,3}
var output []int

godash.Uniq(input, &output)

fmt.Println(output)

// Output: [1 2 3 4]

[ImShakthi]

@aswinkarthik I will work on this issue