Added some missing files to export ignore

GrahamCampbell · web-flow · commit 07417fa38404 · 2016-07-31T13:17:49.000+01:00
diff --git a/.gitattributes b/.gitattributes
@@ -8,3 +8,6 @@
 /phpunit.xml.dist   export-ignore
 /.scrutinizer.yml   export-ignore
 /tests              export-ignore
+/CONTRIBUTING.md    export-ignore
+/README.md          export-ignore
+/server-push.png    export-ignore
