Remove lgtm badge from README (#212)

The link to lgtm.com is now:
https://github.blog/2022-08-15-the-next-step-for-lgtm-com-github-code-scanning/
And the badge seems not working anymore.

Author: okuramasafumi

README.md

@@ -1,7 +1,6 @@
 # eslint-import-resolver-typescript
 
 [![GitHub Actions](https://github.com/import-js/eslint-import-resolver-typescript/workflows/CI/badge.svg)](https://github.com/import-js/eslint-import-resolver-typescript/actions/workflows/ci.yml)
-[![Language grade: JavaScript](https://img.shields.io/lgtm/grade/javascript/g/import-js/eslint-import-resolver-typescript.svg?logo=lgtm&logoWidth=18)](https://lgtm.com/projects/g/import-js/eslint-import-resolver-typescript/context:javascript)
 [![type-coverage](https://img.shields.io/badge/dynamic/json.svg?label=type-coverage&prefix=%E2%89%A5&suffix=%&query=$.typeCoverage.atLeast&uri=https%3A%2F%2Fraw.githubusercontent.com%2Fimport-js%2Feslint-import-resolver-typescript%2Fmaster%2Fpackage.json)](https://github.com/plantain-00/type-coverage)
 [![npm](https://img.shields.io/npm/v/eslint-import-resolver-typescript.svg)](https://www.npmjs.com/package/eslint-import-resolver-typescript)
 [![GitHub Release](https://img.shields.io/github/release/import-js/eslint-import-resolver-typescript)](https://github.com/import-js/eslint-import-resolver-typescript/releases)