Update spelling.yml

Author: nlogozzo

.github/workflows/spelling.yml

@@ -15,5 +15,5 @@ jobs:
       - uses: codespell-project/actions-codespell@master
         with:
           check_filenames: true
-          skip: cargo-sources.json,.git,*.svg,*.html,*.js,*.po,*.pot,*.page,*.map,sqlite3.h,sqlite3.c
+          skip: cargo-sources.json,.git,*.svg,*.html,*.js,*.po,*.pot,*.page,*.map,*.rtf,,pch.h,CONTRIBUTING.md
           ignore_words_list: gir