v0.1.2; bump compat for PhyloNetworks to v0.16

[cecileane]

• PN v0.15 removed, because now using getchild (etc.), hassinglechild and getchildedge from PN -- with removal of hassinglechild and singlechildedge from here.
• better doc, about correlated inheritance model in particular
• citation file

[codecov-commenter]

Codecov Report

Patch coverage: 100.00% and no project coverage change.

Comparison is base (25fd117) 100.00% compared to head (1f6b201) 100.00%.

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Additional details and impacted files

@@            Coverage Diff            @@
##              main       #10   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            4         4           
  Lines          248       243    -5     
=========================================
- Hits           248       243    -5     

Impacted Files	Coverage Δ
src/simulatecoalescent_network.jl	100.00% <100.00%> (ø)
src/simulatecoalescent_onepop.jl	100.00% <100.00%> (ø)
src/utils.jl	100.00% <100.00%> (ø)

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