Small changes to fix some warnings #57
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I found some warnings when I built the project (rustc 1.49-beta3 on MacOS BigSur).
One of them seems to be because the use of env:home_dir is deprecated in favour (so far) of the 'home' crate with the same function name. The other warning appears to be because write_all can return an error if an individual write fails, which means the code was ignoring a result, so I added an 'expect' to each of the write_all calls.