Bump Erlang and RabbitMQ for Travis CI

Author: acogoluegnes

.travis.yml

@@ -14,7 +14,7 @@ addons:
       - sourceline: deb https://packages.erlang-solutions.com/ubuntu trusty contrib
         key_url: https://packages.erlang-solutions.com/ubuntu/erlang_solutions.asc
     packages:
-      - esl-erlang=1:20.3
+      - esl-erlang=1:21.1
 # because of https://github.com/travis-ci/travis-ci/issues/8906
 before_install:
   - sudo mv /opt/jdk_switcher/jdk_switcher.sh /tmp

bin/before_build.sh

@@ -1,8 +1,8 @@
 #!/bin/sh
 
-wget https://github.com/rabbitmq/rabbitmq-server/releases/download/v3.7.8/rabbitmq-server-generic-unix-3.7.8.tar.xz
-tar xf rabbitmq-server-generic-unix-3.7.8.tar.xz
-mv rabbitmq_server-3.7.8 rabbitmq
+wget https://github.com/rabbitmq/rabbitmq-server/releases/download/v3.7.8/rabbitmq-server-generic-unix-3.7.9.tar.xz
+tar xf rabbitmq-server-generic-unix-3.7.9.tar.xz
+mv rabbitmq_server-3.7.9 rabbitmq
 
 rabbitmq/sbin/rabbitmq-server -detached