Reject trailing bytes

[ZoeyR]

Closes #193

There were two design possibilities I considered for tackling this problem. The current one changes the impls on SliceReader to be impls for &mut SliceReader. This allows me to access it after passing it to the deserializer. The other option would be to allow pub(restricted) access to the reader field of the deserializer and access it from there.

[ZoeyR]

Finally got around to updating this to current bincode after 2.5 years 😅

[ZoeyR]

I've realized that this might be considered a breaking change.

[strega-nil]

I was the person who was saying that this should be considered a breaking change, fwiw.

[codecov-commenter]

Codecov Report

Merging #198 into master will increase coverage by 0.08%.
The diff coverage is 63.63%.

@@            Coverage Diff             @@
##           master     #198      +/-   ##
==========================================
+ Coverage   61.33%   61.42%   +0.08%     
==========================================
  Files          10       11       +1     
  Lines         807      827      +20     
==========================================
+ Hits          495      508      +13     
- Misses        312      319       +7     

Impacted Files	Coverage Δ
src/config/legacy.rs	0.00% <ø> (ø)
src/de/mod.rs	77.77% <ø> (ø)
src/lib.rs	75.00% <ø> (ø)
src/config/mod.rs	40.35% <28.57%> (+0.35%)	⬆️
src/config/trailing.rs	57.14% <57.14%> (ø)
src/de/read.rs	54.54% <100.00%> (+1.71%)	⬆️
src/internal.rs	97.22% <100.00%> (+0.34%)	⬆️

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[ZoeyR]

cc @strega-nil