Add LGTM.com code quality badges

README.md

@@ -10,6 +10,8 @@ build system.
 [![Travis](https://travis-ci.org/mesonbuild/meson.svg?branch=master)](https://travis-ci.org/mesonbuild/meson)
 [![Appveyor](https://ci.appveyor.com/api/projects/status/7jfaotriu8d8ncov?svg=true)](https://ci.appveyor.com/project/mesonbuild/meson)
 [![Codecov](https://codecov.io/gh/mesonbuild/meson/coverage.svg?branch=master)](https://codecov.io/gh/mesonbuild/meson/branch/master)
+[![Code Quality: Python](https://img.shields.io/lgtm/grade/python/g/mesonbuild/meson.svg?logo=lgtm&logoWidth=18)](https://lgtm.com/projects/g/mesonbuild/meson/context:python)
+[![Total Alerts](https://img.shields.io/lgtm/alerts/g/mesonbuild/meson.svg?logo=lgtm&logoWidth=18)](https://lgtm.com/projects/g/mesonbuild/meson/alerts)
 
 #### Dependencies