add postal address (closes #41)

src/_includes/contact.html

@@ -8,5 +8,13 @@
       If you use encrypted email, here is our <a href="{{ "/assets/pgp/autonomic-key.asc" | relative_url }}">PGP key</a>.
       Our key fingerprint is: <br/><code id="fingerprint">82FC 87C5 1A71 902F DC10 2CF5 4F90 D55B B24B 1147</code>
     </p>
+
+    <p>Our postal address is:</p>
+    <address>
+        Autonomic Co-operative</br>
+        1539 Pershore Road </br>
+        Stirchley</br>
+        B30 2JH
+    </address>
   </header>
 </section>