Updated usage of "not expr1 in expr2" to support Elixir 1.5+ #76
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Elixir 1.5+ shall be deprecating this operation.
I just added parentheses to fix this and also support earlier Elixir versions.
See the reported warning below:
"not expr1 in expr2" is deprecated. Instead use "expr1 not in expr2" if you require Elixir v1.5+, or "not(expr1 in expr2)" if you have to support earlier Elixir versions.