change memmap2 version from 0.2.0 -> 0.5.0 to support wasm #1470
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As mentioned here RazrFalcon/memmap2-rs#17 (comment), it's not possible to compile memmap2 0.2.0 for wasm-unknwon-unknwon, and this propagate to polars-io that has memmap as a dependency when the "csv-file" feature is enabled. Updating the version of memmap2 solves this problem.