Removed dev from gitignore

See #226

.gitignore

@@ -1,14 +1,2 @@
-vendor/phpunit
 .phpunit.result.cache
 vendor/bin/
-vendor/doctrine/
-vendor/hamcrest/
-vendor/mockery/
-vendor/myclabs/
-vendor/nikic/
-vendor/omnipay/tests
-vendor/phar-io
-vendor/php-http/client-common
-vendor/php-http/mock-client
-vendor/psr/http-factory
-vendor/sebastian