Update README - add support matrix and mod_authz_unixgroup info

README.md

@@ -8,8 +8,26 @@ Original Author: Nathan Neulinger ([email protected])
 
 ![high-level overview diagram of mod_authnz_external](/documentation/mod_authnz_external%20overview.png)
 
+### Support Matrix
+
+<table><thead><th>Apache Version</th><th>mod_authnz_external Version</th><th>mod_authz_unixgroup Version</th><th>Supported?</th></thead><tbody>
+<tr><td rowspan='2'> Apache 2.4 </td><td> <b>mod_authnz_external 3.3.x</b> </td><td> <b>mod_authz_unixgroup 1.2.x</b> </td><td> Yes </td></tr>
+<tr><td></td><td> mod_authz_unixgroup 1.1.x </td><td> - </td></tr>
+<tr><td> Apache 2.2 </td><td> mod_authnz_external 3.1.x or 3.2.x </td><td> mod_authz_unixgroup 1.0.x </td><td> - </td></tr>
+<tr><td> Apache 2.0 </td><td> mod_auth_external 2.2.x </td><td> - </td><td> - </td></tr>
+<tr><td> Apache 1.3 </td><td> mod_auth_external 2.1.x </td><td> - </td><td> - </td></tr>
+</tbody></table>
+
+Older versions are provided on an as-is basis in this repo's [branch list](https://github.com/phokz/mod-auth-external/branches/all).
+
 ### Security Considerations
 
 Older versions of mod_auth_external would by default pass logins and passwords into the authentication module using environment variables. This is insecure on some versions of Unix where the contents of environment variables are visible on a 'ps -e' command. In more recent versions, the default is to use a pipe to pass sensitive data. This is secure on all versions of Unix, and is recommended in all installations.
 
 People using mod_auth*_external with pwauth to authenticate from system password databases should be aware of the [innate security risks](http://code.google.com/p/pwauth/wiki/Risks) involved in doing this.
+
+### mod_authz_unixgroup
+
+This repo is also the home of mod_authz_unixgroup, a unix group access control module for the [Apache HTTP Server](http://httpd.apache.org).
+
+Source is available in the [mod_authz_unixgroup subfolder](https://github.com/phokz/mod-auth-external/tree/master/mod_authz_unixgroup), and releases can be found tagged with the "mod_authz_unixgroup-" prefix [here](https://github.com/phokz/mod-auth-external/tags).