Qulacs

Some fix of the document.

New feature
- GPU support! (huge thanks to puyokw, corryvrequan!)

Updates
- Tutorial (thanks corryvrequan!)
- Set vector of QuantumState from numpy array(thanks corryvrequan, mshrn!)
- added Adaptive gate(61, thanks corryvrequan!)
- added a new function get_gate_count for getting the number of gates in a circuit(62, thanks kosukemtr, corryvrequan!)
- add get_gate function in QuantumCircuit class(54, thanks kosukemtr, corryvrequan!)
- Making PauliOperator class availalble to use some limited operation for non hermitian operators(thanks! hal0taso)
- Change memory policy in quantum state(hanks corryvrequan!)
- CI test for pip (thanks, y-yu!)

Bug Fixes
- When calling add_gate kernel crashes (63, thanks kosukemtr, corryvrequan!)

This release note includes all updates, bugfixes since qulacs release.

Updates
- Register PyPI (thanks TenninYan!)
- Install CI tools (thanks TenninYan and y-yu!)
- Improve installation script for more versions of CMake, gcc, python (thanks corryvrequan, TenninYan, and yurisan!)
- Improve and translate documentation (thanks corryvrequan, TenninYan, and kamakiri01!)
- Rename Hamiltonian class to Observable (thanks corryvrequan!)
- Add utility functions to Observable class (thanks hal0taso, corryvrequan!)

Bug Fixes
- When calling ProbabilisticGate kernel crashes (45, thanks corryvrequan!)
- The output values of transition_amplitde_... function are wrong (37, thanks corryvrequan!)
- Install fails (35, thanks yurisan!)
- python crashing after calling qulacs.observable.add_operator(mpt) (34, thanks hal0taso!)