.gitattributes: update for newly added config files

.gitattributes

@@ -5,15 +5,20 @@
 # https://www.reddit.com/r/PHP/comments/2jzp6k/i_dont_need_your_tests_in_my_production
 # https://blog.madewithlove.be/post/gitattributes/
 #
-/.coveralls.yml export-ignore
-/.gitattributes export-ignore
-/.gitignore export-ignore
-/.github/ export-ignore
-/phpcs.xml.dist export-ignore
-/phpdoc.xml.dist export-ignore
-/phpunit.xml.dist export-ignore
-/docs/ export-ignore
-/Tests/ export-ignore
+.coveralls.yml          export-ignore
+.gitattributes          export-ignore
+.gitignore              export-ignore
+.markdownlint-cli2.yaml export-ignore
+.remarkignore           export-ignore
+.remarkrc               export-ignore
+.yamllint.yml           export-ignore
+phpcs.xml.dist          export-ignore
+phpdoc.dist.xml         export-ignore
+phpdoc.xml.dist         export-ignore
+phpunit.xml.dist        export-ignore
+/.github/               export-ignore
+/docs/                  export-ignore
+/Tests/                 export-ignore
 
 #
 # Auto detect text files and perform LF normalization