* [GENERAL] The package has been completely rewritten.
The core functionality is now implemented in C++ (with OpenMP).
* [GENERAL] Clustering with respect to HDBSCAN*-like
mutual reachability distances is supported.
* [GENERAL] The parallelised Jarnik-Prim algorithm now supports on-the-fly
distance computations. Euclidean minimum spanning tree can be
determined with `mlpack`, which is much faster in low-dimensional spaces.
* [R] R version is now available.
* [Python] [Experimental] The GIc algorithm proposed by Anna Cena
in her 2018 PhD thesis is added.
* [Python] Approximate version based on nearest neighbour graphs produced
by `nmslib` is added.