chore(.travis.yml): fix rocketmq download link error (#20)

.travis.yml

diff --git a/.travis.yml b/.travis.yml
index c7d31e0..f63f55d 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -5,7 +5,7 @@
   NODE_ROCKETMQ_REGISTRY=https://opensource-rocketmq-client-us.oss-us-west-1.aliyuncs.com/
 
 before_script:
-  - wget http://us.mirrors.quenda.co/apache/rocketmq/4.3.2/rocketmq-all-4.3.2-bin-release.zip
+  - wget https://archive.apache.org/dist/rocketmq/4.3.2/rocketmq-all-4.3.2-bin-release.zip
   - unzip rocketmq-all-4.3.2-bin-release.zip
   - cd rocketmq-all-4.3.2-bin-release
   - perl -i -pe's/-Xms8g -Xmx8g -Xmn4g/-Xms2g -Xmx2g -Xmn1g/g' bin/runbroker.sh