README: Remove code quality info

Author: mufeedali

README.md

@@ -4,8 +4,6 @@
 
 A dictionary application for GNOME.
 
-[![Language grade: Python](https://img.shields.io/lgtm/grade/python/g/fushinari/wordbook.svg?logo=lgtm&logoWidth=18)](https://lgtm.com/projects/g/fushinari/wordbook/context:python)
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 **Wordbook** is a dictionary application using the [Open English WordNet](https://github.com/globalwordnet/english-wordnet) database for definitions and the reliable eSpeak for pronunciations (both audio and phoneme).
 
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