v0.12.0

QuantumToolbox v0.12.0

Diff since v0.11.4

Merged pull requests:

• make element-type of zero_ket as complex (#201) (@ytdHuang)
• support real and imag for Qobj (#202) (@ytdHuang)
• introduce rand_unitary and isunitary (#203) (@ytdHuang)
• fix type instabilities for exp (#206) (@ytdHuang)
• Add templates for submitting issues or PRs (#207) (@ytdHuang)
• Update compat with DiffEqCallbacks (#208) (@ytdHuang)

Closed issues:

• Inference check for exp (#205)