Don't package documents from embeds

diff --git a/.pkgmeta b/.pkgmeta
index 19e6ef0..9c084fb 100644
--- a/.pkgmeta
+++ b/.pkgmeta
@@ -20,3 +20,4 @@ ignore:
     - embeds/LibProcessable/.gitmodules
     - embeds/LibProcessable/.pkgmeta
     - embeds/LibProcessable/README.md
+    - embeds/LibProcessable/CONTRIBUTING.md