Qol bugfixing - changelog (#27)

* fixed GST issues except logging

* Added device qubit names to gate labels in GST

* Fixed GHZ plot showing wrong qubit numbers; Improved Hamiltoninan generator code in GST

* Linting

* Update examples/example_gst.ipynb

Co-authored-by: Rakhim Davletkaliyev <rakhim.davletkaliyev@meetiqm.com>

* Update README.md

Co-authored-by: Rakhim Davletkaliyev <rakhim.davletkaliyev@meetiqm.com>

* Update src/mGST/low_level_jit.py docstring

Co-authored-by: Rakhim Davletkaliyev <rakhim.davletkaliyev@meetiqm.com>

* Applied PR feedback: GHZ plot improvements, GST logging and more

* Updated changelog to Version 2.6

* Updated changelog for v2.6: Bugfixes to GHZ plot, GST circuit storage and more; Note on optional dependency mgst; Improved rank 1 GST output tables.

---------

Co-authored-by: Pedro Figueroa <pedro.romero@meetiqm.com>
Co-authored-by: Rakhim Davletkaliyev <rakhim.davletkaliyev@meetiqm.com>

CHANGELOG.rst

@@ -2,6 +2,12 @@
 Changelog
 =========
 
+Version 2.6
+===========
+* Fixed bugs including wrong GHZ plot x-Axis labels and incorrect transpiled and untranspiled circuit storage for mGST.
+* Added note about optional dependency "mgst".
+* Improved display and calculation method for Hamiltonian parameter output of rank 1 compressive GST.
+
 Version 2.5
 ===========
 * Changed simulation method for MRB to 'stabilizer' and simulation circuits are compiled in circuit generation stage.