Sphinx-subprojecttoctree

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* Support Sphinx 4.5, 5.0 and 5.1 (:issue:`35`).
* Loosen requests dependency to major verion (:issue:`35`).

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* When generating a subproject toc, correct links to other subprojects are now generated (:issue:`33`).

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* Fix the index file of a subproject not being updated when the master projecrt index is changed (:issue:`30`).
* Fix an issue where entries in the master project index are not included when they are listed after a subproject (:issue:`28`).
* Add missing request dependency (:issue:`25`).

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* Fixed an issue where the master toctree entries would be added to all subproject root toctrees (:issue:`12`).
* Do not raise when using a non-html builder (:issue:`14`).
* Subprojecttoctree now raises an error when trying to create nested subprojects (:issue:`18`).

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* Fixed an issue where using explicit toctree entries caused 'toctree contains reference to nonexisting document' (:issue:`10`).

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* Fixed an issue where the master file was being read when building main project (:issue:`7`).