Set up Travis CI to run a quick test

.travis.yml

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+language: php
+
+php:
+  - 7.1
+  - 7.2
+
+cache:
+  directories:
+    - $HOME/.composer/cache
+
+install: composer install
+
+script: vendor/bin/phpcs --standard=src/LEVIY/ruleset.xml --basepath=. --report-file=phpcs.log --report-width=120 tests/; diff tests/expected.log phpcs.log

tests/Bar.php

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+<?php
+
+declare(strict_types = 1);
+
+namespace Bar;
+
+use \DateTime;
+
+class Bar
+{
+    const NOW = 'now';
+
+    public function getDate() : DateTime
+    {
+        $now = strtolower(self::NOW);
+
+        return new DateTime($now);
+    }
+}

tests/Foo.php

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+<?php
+declare(strict_types=1);
+
+namespace Bar;
+
+use DateTime;
+
+class Foo
+{
+    private const NOW = 'now';
+
+    public function getDate(): DateTime
+    {
+        return new DateTime(self::NOW);
+    }
+}

tests/expected.log

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+
+FILE: tests/Bar.php
+----------------------------------------------------------------------------------------------------------------------
+FOUND 6 ERRORS AFFECTING 5 LINES
+----------------------------------------------------------------------------------------------------------------------
+  3 | ERROR | [x] Expected 1 newlines between PHP open tag and declare statement, found 2.
+  3 | ERROR | [x] Expected strict_types=1, found strict_types = 1.
+  7 | ERROR | [x] Use statement cannot start with a backslash.
+ 11 | ERROR | [ ] Constant \Bar\Bar::NOW visibility missing.
+ 13 | ERROR | [x] There must be no whitespace between closing parenthesis and return type colon.
+ 15 | ERROR | [x] Function strtolower() should not be referenced via a fallback global name, but via a use statement.
+----------------------------------------------------------------------------------------------------------------------
+PHPCBF CAN FIX THE 5 MARKED SNIFF VIOLATIONS AUTOMATICALLY
+----------------------------------------------------------------------------------------------------------------------
+
+