Add repology badge for package manager versions

 - Repology provides version information for all available package mangers

Author: zbeekman

INSTALL.md

@@ -75,7 +75,16 @@ and re-running CMake.
 ## End-User Installation ##
 
 Most users will find it easiest and fastest to use package management
-software to install OpenCoarrays.  Package management options for
+software to install OpenCoarrays. Below is the status of OpenCoarrays
+in various package managers. If you do not see your favorite package
+manager listed or it is badly out of date, please reach out and ask
+for it to be included or updated, or contribute it yourself. We are
+happy to work with package managers to resolve issues, and adapt our
+build system to play nicely so they don't have to maintain patches.
+
+[![Packaging status][repology-badge]][OC-on-repology]
+
+Package management options for
 macOS, Windows, and Linux are described first below. Also described
 below are options for installing via the Sourcery Institute virtual
 machine or via the bash scripts included that are in the OpenCoarrays
@@ -423,6 +432,9 @@ file.
 
 [URLs]: #
 
+[OC-on-repology]: https://repology.org/project/opencoarrays/versions
+[repology-badge]: https://repology.org/badge/vertical-allrepos/opencoarrays.svg
+
 [FreeBSD ports/packages installation information]: https://www.freebsd.org/doc/en_US.ISO8859-1/books/handbook/ports.html
 [GH all releases badge]: https://img.shields.io/github/downloads/sourceryinstitute/OpenCoarrays/total.svg?style=flat-square
 [GH release badge]: https://img.shields.io/github/release/sourceryinstitute/OpenCoarrays.svg?style=flat-square

README.md

@@ -87,6 +87,17 @@ The default [index.ipynb] notebook is read only, but you can
 execute it, copy it to make changes, or create an entirely
 new [CAF kernel][notebook kernel] notebook.
 
+Packaged Version
+----------------
+
+If you would like to be able to install OpenCoarrays through your
+favorite package manager, please ask them to add it, or contribute it
+yourself. If you see your favorite package manager has an outdated
+version, please ask them to update it, or contribute an update
+yourself.
+
+[![Packaging status][repology-badge]][OC-on-repology]
+
 Getting Started
 ---------------
 
@@ -189,6 +200,9 @@ to aid in development efforts.
 [Jupyter]: https://jupyter.org
 [index.ipynb]: https://nbviewer.jupyter.org/github/sourceryinstitute/jupyter-CAF-kernel/blob/master/index.ipynb
 
+[OC-on-repology]: https://repology.org/project/opencoarrays/versions
+[repology-badge]: https://repology.org/badge/vertical-allrepos/opencoarrays.svg
+
 [build img]: https://img.shields.io/travis/sourceryinstitute/OpenCoarrays.svg?style=flat-square "Build badge"
 [CI Master Branch]: https://travis-ci.org/sourceryinstitute/OpenCoarrays?branch=master "View Travis-CI builds"
 [download img]: https://img.shields.io/github/downloads/sourceryinstitute/OpenCoarrays/total.svg?style=flat-square "Download count badge"