Expected bytes error and import cleanup

[juntyr]

This cleanup PR includes

• a small change to the error message for the unexpected bytes error to print the bytesrting with base64, since that's how it shows up in the ron
• reformatting of all import statements (using the unstable imports_granularity = "Crate" and group_imports = "StdExternalCrate" options)

* [ ] I've included my change in CHANGELOG.md

[codecov-commenter]

Codecov Report

Merging #400 (6039cec) into master (4089034) will decrease coverage by 6.24%.
The diff coverage is 47.36%.

@@            Coverage Diff             @@
##           master     #400      +/-   ##
==========================================
- Coverage   86.55%   80.31%   -6.25%     
==========================================
  Files          49       49              
  Lines        5803     6247     +444     
==========================================
- Hits         5023     5017       -6     
- Misses        780     1230     +450     

Impacted Files	Coverage Δ
src/de/mod.rs	74.46% <ø> (ø)
src/de/value.rs	75.88% <0.00%> (-11.53%)	⬇️
src/options.rs	45.23% <ø> (-14.77%)	⬇️
src/ser/mod.rs	78.05% <ø> (-17.35%)	⬇️
src/ser/tests.rs	82.30% <0.00%> (-17.70%)	⬇️
src/value.rs	53.51% <0.00%> (-13.54%)	⬇️
tests/147_empty_sets_serialisation.rs	86.00% <0.00%> (-14.00%)	⬇️
tests/250_variant_newtypes.rs	94.36% <ø> (-5.64%)	⬇️
tests/depth_limit.rs	84.84% <0.00%> (-15.16%)	⬇️
tests/extensions.rs	78.37% <0.00%> (-21.63%)	⬇️
... and 29 more

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[juntyr]

The codecov changes seem to be spurious since they only affect use statements.