fix race condition around connection count getting

application/application.go

@@ -136,6 +136,8 @@ func (ra *RicochetApplication) Close(onion string) {
 
 // ConnectionCount returns the number of concurrent connections to the application
 func (ra *RicochetApplication) ConnectionCount() int {
+	ra.lock.Lock()
+	defer ra.lock.Unlock()
 	return len(ra.instances)
 }