More List.range simplifications

[lue-bird]

A few very simple ones

List.minimum (List.range 2 3)
--> Just 2

List.maximum (List.range 2 3)
--> Just 3

List.range n n
--> [ n ]

The first 2 are mentioned in #306, last one is listed in #2

[jfmengels]

Very nice 👍
I'll update the issues