Code of conduct amendment: low quality PRs (#1176)

CODE_OF_CONDUCT.md

@@ -33,6 +33,7 @@ Examples of unacceptable behavior include:
 * Public or private harassment
 * Publishing others' private information, such as a physical or email
   address, without their explicit permission
+* Repeated low-quality pull requests or pull requests not in accordance to project goals especially after warning from a project maintainer or administrator
 * Other conduct which could reasonably be considered inappropriate in a
   professional setting
 
@@ -125,4 +126,4 @@ enforcement ladder](https://github.com/mozilla/diversity).
 
 For answers to common questions about this code of conduct, see the FAQ at
 https://www.contributor-covenant.org/faq. Translations are available at
-https://www.contributor-covenant.org/translations.
+https://www.contributor-covenant.org/translations.