feature #153 Update .gitattributes with missing entries (VincentLanglet)

This PR was merged into the 0.4-dev branch.

Discussion
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Update .gitattributes with missing entries

HI `@chalasr`, It seems like the .gitattributes files was outdated

Commits
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b4d05d8 Update .gitattributes

Author: chalasr

.gitattributes

@@ -1,9 +1,11 @@
 /tests export-ignore
 /dev export-ignore
+/.github export-ignore
 /.editorconfig export-ignore
 /.gitattributes export-ignore
 /.gitignore export-ignore
-/.php_cs.dist export-ignore
-/.travis.yml export-ignore
+/.php-cs-fixer.dist export-ignore
 /docker-compose.yml export-ignore
 /phpunit.xml.dist export-ignore
+/.psalm.baseline.xml export-ignore
+/psalm.xml export-ignore