Changes

Added min kmer fraction threshold (#140)
- added --min-kmer-frac for exclusion of low abundance kmers from subtype calling
- detailed report adds columns: kmer_fraction, total_refposition_kmer_frequency, is_kmer_fraction_okay
- increased default --max-kmer-freq for amplicon seq data compatibility
Added bump2version config for easy version updating (#141)
- Bump version with $ bump2version major|minor|patch
Codebase clean-up (#143)
- Added Rich for logging and informative tracebacks
- refactoring and reformatting; fixed some docstrings; simplified some logic
- moved some functions to more appropriate places
- replaced string.format with f-string literals
- moved check_total_kmers call to right after parsing of CLI args
- replaced bio_hansel.parsers._parse_fasta with BioPython's Bio.SeqIO.FastaIO.SimpleFastaParser; forcing uppercase of sequence
- cleaned up some tests
- updated help message to show program name and version as well as nice list of built-in schemes
- ignoring/fixed some warnings when pytest

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