Remove lgtm tags.

Author: T4rk1n

README.md

@@ -5,8 +5,6 @@
 [![PyPI](https://img.shields.io/pypi/v/dash.svg?color=dark-green)](https://pypi.org/project/dash/)
 [![PyPI - Python Version](https://img.shields.io/pypi/pyversions/dash.svg?color=dark-green)](https://pypi.org/project/dash/)
 [![GitHub commit activity](https://img.shields.io/github/commit-activity/y/plotly/dash.svg?color=dark-green)](https://github.com/plotly/dash/graphs/contributors)
-[![LGTM Alerts](https://img.shields.io/lgtm/alerts/g/plotly/dash.svg)](https://lgtm.com/projects/g/plotly/dash/alerts)
-[![LGTM Grade](https://img.shields.io/lgtm/grade/python/g/plotly/dash.svg)](https://lgtm.com/projects/g/plotly/dash/context:python)
 
 #### *Dash is the most downloaded, trusted Python framework for building ML & data science web apps*.