First revision.

.gitignore

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+**/.idea/workspace.xml
+**/.idea/tasks.xml
+**/.idea/*.iws
+**/.idea/dataSources.local.xml
+**/.idea/dictionaries
+/vendor/
+.php_cs.cache
+/tests-report-html/

.php_cs

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+<?php
+
+$finder = PhpCsFixer\Finder::create()
+    ->exclude('vendor')
+    ->in(__DIR__)
+;
+
+return PhpCsFixer\Config::create()
+    ->setRules([
+        '@PSR1' => true,
+        '@PSR2' => true,
+        '@PhpCsFixer' => true,
+        '@PhpCsFixer:risky' => true,
+        'array_syntax' => ['syntax' => 'short'],
+        'php_unit_test_class_requires_covers' => false,
+        'php_unit_test_case_static_method_calls' => ['call_type' => 'self'],
+        'native_function_invocation' => false,
+    ])
+    ->setFinder($finder)
+    ;

.travis.yml

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+language: php
+cache:
+  directories:
+    - $HOME/.composer
+sudo: false
+matrix:
+  fast_finish: true
+  include:
+    - php: '7.1'
+    - php: '7.2'
+    - php: '7.3'
+install:
+  - travis_retry composer install --no-progress --no-interaction --prefer-dist
+script:
+  - ./vendor/bin/php-cs-fixer fix --allow-risky=yes --dry-run -v --stop-on-violation
+  - composer phpunit

README.md

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+[![Build Status](https://travis-ci.org/ddebin/atom-generator.svg?branch=master)](https://travis-ci.org/ddebin/atom-generator)
+
 # atom-generator
+
 Atom feed generator

composer.json

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+{
+  "name": "ddebin/atom-generator",
+  "type": "library",
+  "description": "Atom feed generator",
+  "keywords": [
+    "atom",
+    "feed",
+    "generator"
+  ],
+  "homepage": "https://github.com/ddebin/atom-generator",
+  "license": "MIT",
+  "authors": [
+    {
+      "name": "Damien Debin",
+      "email": "[email protected]"
+    }
+  ],
+  "require": {
+    "php": "^7.1",
+    "webmozart/assert": "^1.5"
+  },
+  "require-dev": {
+    "friendsofphp/php-cs-fixer": "^2.15",
+    "phpunit/phpunit": "^7"
+  },
+  "config": {
+    "platform": {
+      "php": "7.1"
+    }
+  },
+  "autoload": {
+    "psr-4": {
+      "AtomGenerator\\": "src/"
+    }
+  },
+  "autoload-dev": {
+    "psr-4": {
+      "Tests\\": "tests"
+    }
+  },
+  "scripts": {
+    "test": "./vendor/bin/php-cs-fixer fix --allow-risky=yes && ./vendor/bin/phpunit",
+    "phpunit": "./vendor/bin/phpunit"
+  }
+}