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

Author: vv12131415

.gitattributes

@@ -2,6 +2,13 @@
 .gitignore export-ignore
 .scrutinizer.yml export-ignore
 .travis.yml export-ignore
+composer-require-config.json export-ignore
+Makefile export-ignore
+phive.xml export-ignore
+phpcs.xml.dist export-ignore
+phpstan.neon export-ignore
+psalm.xml export-ignore
+/.github/ export-ignore
 /examples/ export-ignore
 /phpmd.xml.dist export-ignore
 /phpunit.xml.dist export-ignore