Bump phpunit

Signed-off-by: Julius Härtl <jus@bitgrid.net>

.drone.yml

@@ -55,7 +55,7 @@ kind: pipeline
 name: unit-php7.1
 steps:
   - name: php7.1
-    image: nextcloudci/php7.1:php7.1-15
+    image: nextcloudci/php7.1:php7.1-16
     environment:
       APP_NAME: deck
       CORE_BRANCH: master

.travis.yml

@@ -9,10 +9,10 @@ env:
     - CORE_BRANCH=master DB=mysql
 
 before_install:
-    - wget https://phar.phpunit.de/phpunit-5.7.phar
-    - chmod +x phpunit-5.7.phar
+    - wget https://phar.phpunit.de/phpunit-6.5.phar
+    - chmod +x phpunit-6.5.phar
     - mkdir bin
-    - mv phpunit-5.7.phar bin/phpunit
+    - mv phpunit-6.5.phar bin/phpunit
     - export PATH="$PWD/bin:$PATH"
     - phpunit --version
     - wget https://raw.githubusercontent.com/nextcloud/travis_ci/master/before_install.sh