Use php 7.1

.ddev/config.yaml

@@ -2,7 +2,7 @@ APIVersion: v0.19.0
 name: typo3.org
 type: typo3
 docroot: html
-php_version: "7.0"
+php_version: "7.1"
 router_http_port: "8080"
 router_https_port: "8443"
 xdebug_enabled: false

.gitlab-ci.yml

@@ -13,7 +13,7 @@ stages:
 
 build:
     stage: build
-    image: php:7.0-alpine
+    image: php:7.1-alpine
     variables:
         GIT_STRATEGY: "clone"
         GIT_SUBMODULE_STRATEGY: "recursive"