Update alphabet API

[codecov-io]

Codecov Report

Merging #62 (10f22a0) into master (c219aa3) will increase coverage by 4.19%. The diff coverage is 33.33%.

@@            Coverage Diff             @@
##           master      #62      +/-   ##
==========================================
+ Coverage   68.30%   72.49%   +4.19%     
==========================================
  Files           7        7              
  Lines         306      309       +3     
==========================================
+ Hits          209      224      +15     
+ Misses         97       85      -12     

Impacted Files	Coverage Δ
cli/src/main.rs	0.00% <0.00%> (ø)
src/lib.rs	100.00% <ø> (ø)
src/decode.rs	63.52% <33.33%> (+3.31%)	:arrow_up:
src/encode.rs	82.97% <33.33%> (+3.56%)	:arrow_up:
src/alphabet.rs	55.55% <44.82%> (+55.55%)	:arrow_up:

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[Nemo157]

bors r+

[bors[bot]]

Build succeeded:

• cargo audit
• cargo clippy
• cargo doc --cfg docsrs
• cargo fmt --check
• cargo hack check --feature-powerset
• cargo test
• cargo test --shallow-minimal-versions
• cargo test (stable, i686-pc-windows-msvc, windows-latest)
• cargo test (stable, i686-unknown-linux-gnu, ubuntu-latest)
• cargo test (stable, x86_64-apple-darwin, macos-latest)
• cargo test (stable, x86_64-pc-windows-msvc, windows-latest)
• cargo test (stable, x86_64-unknown-linux-gnu, ubuntu-latest)