Update threshold for genotyping

[standage]

This update changes the default genotyping threshold for low effective coverage loci from 8 reads to 10, and corrects the USA8k notebook to account for this update.

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• Changes are clearly described above
• Any relevant issue threads are referenced in the description
• Any new features are tested (see docs/DEVEL.md for details)
• Substantial changes are documented in CHANGELOG.md (see https://keepachangelog.com/en/1.0.0/)

[codecov-io]

Codecov Report

Merging #61 into master will not change coverage.
The diff coverage is 100%.

@@           Coverage Diff           @@
##           master      #61   +/-   ##
=======================================
  Coverage   97.27%   97.27%           
=======================================
  Files          28       28           
  Lines         843      843           
  Branches      155      155           
=======================================
  Hits          820      820           
  Misses         11       11           
  Partials       12       12

Impacted Files	Coverage Δ
microhapulator/cli/type.py	100% <ø> (ø)	⬆️
microhapulator/genotype.py	96.42% <100%> (ø)	⬆️
microhapulator/type.py	97.1% <100%> (ø)	⬆️

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