TestOrderedMap has a redundant for loop

[zamicol]

https://github.com/iancoleman/orderedmap/blob/7c914fa9a8916d5034a6b55c92f606b35bc4e5ba/orderedmap_test.go#L68

    // Keys method
    keys := o.Keys()
    expectedKeys := []string{
        "number",
        "string",
        "strings",
        "mixed",
    }
    for i, key := range keys {
        if key != expectedKeys[i] {
            t.Error("Keys method", key, "!=", expectedKeys[i])
        }
    }
    for i, key := range expectedKeys {
        if key != expectedKeys[i] {
            t.Error("Keys method", key, "!=", expectedKeys[i])
        }
    }

The second for loop is not meaningful. I'm assuming that it was meant for a values method or to test values. It's possible it was also copy-pasta.