🐚 Shell integration

[ticky]

This adds shell integration for bash, zsh and fish, allowing for automatically using coloursum to colour output from checksum commands.

[codecov-io]

Codecov Report

Merging #2 (a92d88e) into develop (80bb83a) will increase coverage by 10.58%.
Report is 2 commits behind head on develop.
The diff coverage is 32.07%.

❗ Current head a92d88e differs from pull request most recent head 6baa8ab. Consider uploading reports for the commit 6baa8ab to get more accurate results

@@             Coverage Diff              @@
##           develop       #2       +/-   ##
============================================
+ Coverage    52.63%   63.21%   +10.58%     
============================================
  Files            5        5               
  Lines          114      174       +60     
============================================
+ Hits            60      110       +50     
- Misses          54       64       +10     

Files Changed	Coverage Δ
src/main.rs	0.00% <0.00%> (ø)
src/ansi_coloured_line.rs	95.65% <100.00%> (+21.96%)	⬆️
src/base_line.rs	82.69% <100.00%> (+36.35%)	⬆️
src/ecoji_line.rs	96.00% <100.00%> (+22.31%)	⬆️
src/onepassword_line.rs	95.45% <100.00%> (+23.23%)	⬆️

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