Remove non-dist files from .ratignore

Rat should be run on the dist directory to be sure that all files in the
distribution have proper license headers, so it does not need to include
files that are not in the distribution anyway.
diff --git a/.ratignore b/.ratignore
index 6d69c05..812a6c5 100644
--- a/.ratignore
+++ b/.ratignore
@@ -1,17 +1,9 @@
-\.asf.yaml
 \.editorconfig
 \.eslintignore
-\.gitattributes
-\.gitignore
-\.lintstagedrc
 \.npmignore
-\.ratignore
-\.travis.yml
-husky.sh
 lerna\.json
 node_modules
 package\.json
-repolinter\.json
 tsconfig(\.\w+)?\.json
 typedoc\.json
 yarn\.lock