Update v0.6 of the hafnian library

[josh146]

No description provided.

[codecov]

Codecov Report

Merging #10 into master will decrease coverage by 4.65%.
The diff coverage is 90.83%.

@@            Coverage Diff             @@
##           master      #10      +/-   ##
==========================================
- Coverage   98.75%   94.09%   -4.66%     
==========================================
  Files           6        8       +2     
  Lines         240      457     +217     
==========================================
+ Hits          237      430     +193     
- Misses          3       27      +24

Impacted Files	Coverage Δ
hafnian/quantum.py	97.65% <100%> (ø)	⬆️
hafnian/_hafnian.py	100% <100%> (ø)	⬆️
hafnian/_permanent.py	100% <100%> (ø)	⬆️
hafnian/_torontonian.py	100% <100%> (ø)	⬆️
hafnian/__init__.py	100% <100%> (ø)	⬆️
hafnian/_version.py	100% <100%> (ø)	⬆️
hafnian/samples.py	83.33% <83.33%> (ø)
hafnian/reference.py	98.73% <98.73%> (ø)

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