remove (from publishing) files that are not needed for end user

.gitattributes

@@ -2,8 +2,16 @@
 /.gitignore export-ignore
 /.scrutinizer.yml export-ignore
 /.travis.yml export-ignore
+/composer-require-config.json export-ignore
 /composer.lock export-ignore
-/examples/ export-ignore
 /phpmd.xml.dist export-ignore
 /phpunit.xml.dist export-ignore
+/Makefile export-ignore
+/phive.xml export-ignore
+/phpcs.xml.dist export-ignore
+/phpstan.neon export-ignore
+/psalm.xml export-ignore
 /tests/ export-ignore
+/examples/ export-ignore
+/.dependabot/ export-ignore
+/.github/ export-ignore