Add dev files to dist

.gitattributes

@@ -1,14 +1,19 @@
 # Path-based git attributes
 # https://www.kernel.org/pub/software/scm/git/docs/gitattributes.html
 
-/.editorconfig      export-ignore
-/.gitattributes     export-ignore
-/.gitignore         export-ignore
-/.php_cs            export-ignore
-/.sami.dist         export-ignore
-/.scrutinizer.yml   export-ignore
-/.styleci.yml       export-ignore
-/.travis.yml        export-ignore
+/coverage           export-ignore
 /docs               export-ignore
-/phpunit.xml.dist   export-ignore
-/tests              export-ignore
+
+# Uncomment the lines below for your package; 
+# These are basically files you don't want in a release.
+
+# /.editorconfig      export-ignore
+# /.gitattributes     export-ignore
+# /.gitignore         export-ignore
+# /.php_cs            export-ignore
+# /.sami.dist         export-ignore
+# /.scrutinizer.yml   export-ignore
+# /.styleci.yml       export-ignore
+# /.travis.yml        export-ignore
+# /phpunit.xml.dist   export-ignore
+# /tests              export-ignore