PHPLIB-132: Add MongoDB 3.2 to Travis CI build matrix

Author: jmikola

.travis.yml

@@ -16,9 +16,11 @@ env:
     - DRIVER_VERSION=1.1.1 SERVER_VERSION=2.4
     - DRIVER_VERSION=1.1.1 SERVER_VERSION=2.6
     - DRIVER_VERSION=1.1.1 SERVER_VERSION=3.0
+    - DRIVER_VERSION=1.1.1 SERVER_VERSION=3.2
 
 before_install:
   - sudo apt-key adv --keyserver ${KEY_SERVER} --recv 7F0CEB10
+  - sudo apt-key adv --keyserver ${KEY_SERVER} --recv EA312927
   - echo "deb ${MONGO_REPO_URI} ${MONGO_REPO_TYPE}${SERVER_VERSION} multiverse" | sudo tee ${SOURCES_LOC}
   - sudo apt-get update -qq