v0.5.6

QuantumOpticsBase v0.5.6

Diff since v0.5.5

Merged pull requests:

• Importing metrics from QuantumInterface.jl (#185) (@Hamiltonian-Action)
• Remove bases and sortedindices tests as they live in QuantumInterface (#190) (@akirakyle)
• Fix printing of SparseOpPureType (#195) (@apkille)
• Remove _permutedims in favor of Base.PermutedDimsArray (#197) (@akirakyle)

Closed issues:

• Fix sparse operator printing (#45)