CI setup.

.gitlab-ci.yml

+stages:
+  - test
+  - deploy
+
+.test: &test
+  stage: test
+  tags: [docker]
+  image: php:${CI_JOB_NAME}-cli-alpine
+  variables:
+    COMPOSER_ALLOW_SUPERUSER: "1"
+  before_script:
+    - curl -sSL https://github.com/composer/composer/releases/download/1.8.4/composer.phar --output /usr/local/bin/composer
+    - chmod +x /usr/local/bin/composer
+    - apk update && apk add unzip git
+    - php -v
+    - composer -V
+    - composer global require hirak/prestissimo
+  script:
+    - composer install
+    - php -l src/*.php
+    - vendor/bin/php-cs-fixer fix --verbose --dry-run --using-cache=no
+  cache:
+    key: composer-cache
+    paths:
+      - /root/.composer/cache
+
+"7.0":
+  <<: *test
+
+"7.1":
+  <<: *test
+
+"7.2":
+  <<: *test
+
+"7.3":
+  <<: *test
+
+deploy:
+  stage: deploy
+  tags: [docker]
+  image: appropriate/curl
+  script: ./.packagist.sh

.packagist.sh

+#!/usr/bin/env sh
+curl -fsSL \
+    -H"Content-Type: application/json" \
+    -d'{"repository":{"url":"'$CI_PROJECT_URL'.git"}}' \
+    "https://packagist.org/api/update-package?username=$PACKAGIST_USERNAME&apiToken=$PACKAGIST_TOKEN"

composer.json

@@ -10,7 +10,7 @@
         }
     ],
     "require": {
-        "php": "^5.6 | ^7.0",
+        "php": "^7.0",
         "ext-json": "*",
         "friendsofphp/php-cs-fixer": "^2.13"
     },
@@ -19,5 +19,8 @@
     },
     "config": {
         "sort-packages": true
+    },
+    "archive": {
+        "exclude": [".?*"]
     }
 }