Update .gitattributes

Remove some files that are no longer needed.
Added the .github folder
Moved it around to follow the listing in GitHub

.gitattributes

@@ -1,15 +1,13 @@
+/.github/ export-ignore
+/tests/ export-ignore
 /.gitattributes export-ignore
 /.gitignore export-ignore
 /.scrutinizer.yml export-ignore
-/.travis.yml export-ignore
-/appveyor.yml export-ignore
-/easy-coding-standard.neon export-ignore
 /Makefile export-ignore
+/composer.lock export-ignore
 /phive.xml export-ignore
 /phpcs.xml.dist export-ignore
 /phpmd.xml.dist export-ignore
 /phpstan.neon export-ignore
-/psalm.xml export-ignore
-/composer.lock export-ignore
 /phpunit.xml.dist export-ignore
-/tests/ export-ignore
+/psalm.xml export-ignore