Add baltimore and centreville. (#26)

Author: robbiethegeek

_includes/banner.html

@@ -3,7 +3,8 @@
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         <h2>Alexandria Code &amp; Coffee</h2>
-        <p>This group meets twice a month on Saturdays at <a href="http://www.fool.com/" class="slightly-bold">The Motley Fool</a> <a href="https://www.google.com/maps?f=q&hl=en&q=2000+Duke+Street,+Alexandria,+VA,+22314,+us">(map)</a> headquarters in Alexandria, Virginia. Developers of all skill levels come together to work on and discuss projects with each other. You may also be interested in our sibling groups <a href="http://novacodecoffee.com/" class="slightly-bold">NoVa Code &amp; Coffee</a> or <a href="https://www.dccodecoffee.com/">DC Code &amp; Coffee</a>.</p>
+        <p>This group meets twice a month on Saturdays at <a href="http://www.fool.com/" class="slightly-bold">The Motley Fool</a> <a href="https://www.google.com/maps?f=q&hl=en&q=2000+Duke+Street,+Alexandria,+VA,+22314,+us">(map)</a> headquarters in Alexandria, Virginia. Developers of all skill levels come together to work on and discuss projects with each other. You may also be interested in our sibling groups <a href="http://novacodecoffee.com" class="slightly-bold">NoVa Code &amp; Coffee</a>, <a href="https://www.dccodecoffee.com/" class="slightly-bold">DC Code &amp; Coffee</a>, <a href="https://www.meetup.com/Centreville-Code-Coffee/" class="slightly-bold">Centreville Code &amp; Coffee</a>, and <a href="https://www.meetup.com/Baltimore-Code-and-Coffee/" class="slightly-bold">Baltimore Code &amp; Coffee</a>.</p>
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         <h3>Chat</h3>