Fix OS X Travis.

robinlinden · robinlinden · commit c49a6e7f5bc2 · 2017-10-25T23:05:02.000+02:00
diff --git a/other/travis/toxcore-osx-install b/other/travis/toxcore-osx-install
@@ -1,3 +1,6 @@
 #!/bin/sh
 
+# Workaround for bug in Homebrew where it only finds an old Ruby version.
+brew update
+
 brew install libsodium libvpx opus libconfig check astyle
