Update MongoDB versions tested in travis

Author: estolfo

.travis.yml

@@ -22,8 +22,9 @@ env:
     - JRUBY_OPTS="--server -J-Xms512m -J-Xmx1024m"
   matrix:
     - MONGODB=2.4.14
-    - MONGODB=2.6.10
-    - MONGODB=3.0.3
+    - MONGODB=2.6.11
+    - MONGODB=3.0.7
+    - MONGODB=3.2.0
 
 before_script:
   - wget http://fastdl.mongodb.org/linux/mongodb-linux-x86_64-${MONGODB}.tgz -O /tmp/mongodb.tgz