Loosen type constraints

[david-pl]

Requires qojulia/QuantumOpticsBase.jl#28

[codecov]

Codecov Report

Merging #306 (5cb2965) into master (040776d) will increase coverage by 0.01%.
The diff coverage is 98.94%.

@@            Coverage Diff             @@
##           master     #306      +/-   ##
==========================================
+ Coverage   97.98%   98.00%   +0.01%     
==========================================
  Files          16       16              
  Lines        1337     1400      +63     
==========================================
+ Hits         1310     1372      +62     
- Misses         27       28       +1     

Impacted Files	Coverage Δ
src/schroedinger.jl	88.88% <90.00%> (-0.77%)	⬇️
src/semiclassical.jl	96.62% <94.44%> (-0.18%)	⬇️
src/bloch_redfield_master.jl	93.42% <100.00%> (ø)
src/master.jl	98.26% <100.00%> (+0.69%)	⬆️
src/mcwf.jl	100.00% <100.00%> (ø)
src/phasespace.jl	98.69% <100.00%> (-0.01%)	⬇️
src/steadystate.jl	91.17% <100.00%> (ø)
src/stochastic_base.jl	100.00% <100.00%> (ø)
src/stochastic_master.jl	97.18% <100.00%> (+0.04%)	⬆️
src/stochastic_schroedinger.jl	100.00% <100.00%> (ø)
... and 5 more

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