ci(travis): remove unavailable files from markdown-toc process

Author: myii

.travis.yml

@@ -54,8 +54,6 @@ jobs:
 
         # Update Tables of Content in the relevant `.md` files
         - npm install markdown-toc -D
-        - markdown-toc -i CONTRIBUTING.md
-        # - markdown-toc -i README.md
         - markdown-toc -i TOFS_pattern.md
 
         # Install all dependencies required for `semantic-release`