Use contains method from Range

[EnverOsmanov]

Related issues: #227, #278
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The problem:

contains method in Range has no override modifier. So after upcast Range to Seq[Int], usage of contains cost us O(n) (or even O(n) * n in total, since we call contains for each row). That means the bigger file is, the more rows file has the longer spark-excel will read the file.

I found out this was fixed in Scala 2.13.3.

[nightscape]

Oh wow, great find!
I deliberately put the Seq[Int] there so that we could later allow selecting arbitrary rows, but that doesn't justify making it unusable for bigger files.
One last thing we could try is to introduce a subclass of Range that applies the same method override as in the Scala 2.13.3 PR.
Would you mind giving that a shot?

[nightscape]

Never mind, Range is sealed...