[readme] remove defunct badges

Author: ljharb

readme.markdown

@@ -4,8 +4,6 @@
 
 [![github actions][actions-image]][actions-url]
 [![coverage][codecov-image]][codecov-url]
-[![dependency status][deps-svg]][deps-url]
-[![dev dependency status][dev-deps-svg]][dev-deps-url]
 [![License][license-image]][license-url]
 [![Downloads][downloads-image]][downloads-url]