Update to 2018 edition and prune dependencies #63
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Update the project to 2018 edition in both code and documentation for
usage, prunes unused dependencies and removes dependency on failure,
preferring the std Error trait.
There was also a misleading error message about not being able to find a
temporary file directory, which would have actually have been caused by
a failure to encode a filepath into UTF-8
(https://doc.rust-lang.org/src/std/path.rs.html#1848-1850). However this
error should not happen anyway by just using the PathBuf directly to
make the full path for the persisted file output.
Should resolve #57
Choose one: is this a 🐛 bug fix, a 🙋 feature, or a 🔦 documentation change?
Feature and docs
Checklist
Context
#57
Semver Changes
Should take a minor bump potentially, but no changes to APIs.