update workaround for openjdk 1.6 buffer overflow

Author: lorban

Diff for: .travis.yml

@@ -1,9 +1,8 @@
 # workaround for buffer overflow issue, ref https://github.com/travis-ci/travis-ci/issues/5227
-before_install:
-  - cat /etc/hosts # optionally check the content *before*
-  - sudo hostname "$(hostname | cut -c1-63)"
-  - sed -e "s/^\\(127\\.0\\.0\\.1.*\\)/\\1 $(hostname | cut -c1-63)/" /etc/hosts | sudo tee /etc/hosts
-  - cat /etc/hosts # optionally check the content *after*
+addons:
+  hosts:
+    - myhostname
+  hostname: myhostname
 
 language: java
 jdk: