Update master php testing versions

Signed-off-by: Joas Schilling <coding@schilljs.com>

.drone.yml

@@ -5,7 +5,7 @@ clone:
 
 pipeline:
   signed-off-check:
-    image: nextcloudci/php7.0:php7.0-2
+    image: nextcloudci/php7.1:php7.1-16
     environment:
       - APP_NAME=activity
       - CORE_BRANCH=master

.travis.yml

@@ -1,6 +1,5 @@
 language: php
 php:
-  - 7.0
   - 7.1
   - 7.2
   - 7.3
@@ -53,15 +52,15 @@ script:
 
 matrix:
   include:
-    - php: 7.0
+    - php: 7.1
       env: DB=mysql
-    - php: 7.0
+    - php: 7.1
       env: DB=pgsql
-    - php: 7.0
+    - php: 7.1
       env: DB=mysql;CODECHECK=1
-    - php: 7.0
+    - php: 7.1
       env: DB=mysql;CODECHECK=2
-    - php: 7.0
+    - php: 7.1
       env: DB=mysql;JSTESTS=1
   allow_failures:
     - env: DB=mysql;CODECHECK=2