Cluster

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This is a "house-keeping" commit. No new features or fixes are introduced.

* Update CI test rules to include amd64 and ppc (santosh653)

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This is a "house-keeping" commit. No new features or fixes are introduced.

* Update changelog.
* Removed the ``Pipfile`` which was introduced in ``1.4.1.post1``. The file
caused false positives on security checks. Additionally, having a ``Pipfile``
is mainly useful in applications, and not in libraries like this one.

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This is a "house-keeping" commit. No new features or fixes are introduced.

* Update changelog.
* Switch doc-building to use ``pipenv`` & update ``Pipfile`` accordingly.

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* Fix clustering of dictionaries. See GitHub issue 28 (Tim Littlefair).

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* Added a "display" method to hierarchical clusters (by 1kastner).

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* Fix regression introduced in 1.3.1 related to package version metadata.