Bumped version to 2.0-RC2

bigbluebutton-config/bigbluebutton-release

-BIGBLUEBUTTON_RELEASE=2.0.0-RC1
+BIGBLUEBUTTON_RELEASE=2.0.0-RC2

bigbluebutton-config/web/index.html

@@ -262,7 +262,7 @@
 	      <div class="row">
 	      	<div class="span twelve center">
 		        <p>Copyright &copy; 2018 BigBlueButton Inc.<br>
-		        <small>Version <a href="http://docs.bigbluebutton.org/">2.0-RC1</a></small>		        
+		        <small>Version <a href="http://docs.bigbluebutton.org/">2.0-RC2</a></small>		        
 		        </p>
 	      	</div>
 	      </div>