remove() does not handle references correctly

[AntonBogun]

The code

let l=[[1],[2]]
l.remove(0,2)
print(l)

results in a post-execution warning: LEAKS FOUND (this indicates cycles in your object graph, or a bug in Lobster) _-1_ = [2]

Note that the same applies when using strings, but not integers, which leads me to believe that this is an issue only with referenced values.

[aardappel]

Fixed here: https://github.com/aardappel/lobster/commit/8071024d25b265a7534ecb69dc413f99a313143a