Run test by PHPStan in Travis CI jobs

[peter-gribanov]

Run test by PHPStan in Travis CI jobs. Ignore error of Phar::decompress() in PHPStan #37 Exclude Configuration class from analyse because it is highly dependent on the version of Symfony.

Symfony 2.3 - 3.4

Line	src/DependencyInjection/Configuration.php
42	Class Symfony\Component\Config\Definition\Builder\TreeBuilder does not have a constructor and must be instantiated without any parameters.
188	Class Symfony\Component\Config\Definition\Builder\TreeBuilder does not have a constructor and must be instantiated without any parameters.

Symfony 4.0 - 4.4

Line	src/DependencyInjection/Configuration.php
165	Call to an undefined method Symfony\Component\Config\Definition\Builder\NodeDefinition::fixXmlConfig().
166	Call to an undefined method Symfony\Component\Config\Definition\Builder\NodeDefinition::children().
172	Call to an undefined method Symfony\Component\Config\Definition\Builder\NodeDefinition::children().
174	Call to an undefined method Symfony\Component\Config\Definition\Builder\NodeDefinition::children().
177	Call to an undefined method Symfony\Component\Config\Definition\Builder\NodeDefinition::fixXmlConfig().
178	Call to an undefined method Symfony\Component\Config\Definition\Builder\NodeDefinition::append().
199	Call to an undefined method Symfony\Component\Config\Definition\Builder\NodeDefinition::requiresAtLeastOneElement().
259	Method GpsLab\Bundle\GeoIP2Bundle\DependencyInjection\Configuration::getDatabaseNode() should return Symfony\Component\Config\Definition\Builder\ArrayNodeDefinition but returns Symfony\Component\Config\Definition\Builder\NodeDefinition.

Symfony 5.0

Line	src/DependencyInjection/Configuration.php
49	Call to an undefined method Symfony\Component\Config\Definition\Builder\TreeBuilder::root().
195	Call to an undefined method Symfony\Component\Config\Definition\Builder\TreeBuilder::root().

[coveralls]

Coverage remained the same at 100.0% when pulling 0ef7ebc11d07b91b9e092c6806adc6868bc9967e on peter-gribanov:phpstan into bb7e24c0727427505d4893d43f52a6c6422e96a8 on gpslab:2.0.

[coveralls]

Coverage remained the same at 100.0% when pulling 0ef7ebc11d07b91b9e092c6806adc6868bc9967e on peter-gribanov:phpstan into bb7e24c0727427505d4893d43f52a6c6422e96a8 on gpslab:2.0.

[coveralls]

Coverage remained the same at 100.0% when pulling 0ef7ebc11d07b91b9e092c6806adc6868bc9967e on peter-gribanov:phpstan into bb7e24c0727427505d4893d43f52a6c6422e96a8 on gpslab:2.0.

[coveralls]

Coverage remained the same at 100.0% when pulling b52c86a339184d2165877d833ce91dcd5da78aca on peter-gribanov:phpstan into bb7e24c0727427505d4893d43f52a6c6422e96a8 on gpslab:2.0.