chore: Update README.md

LGTM no longer used, removing: ``` ![LGTM Alerts](https://img.shields.io/lgtm/alerts/github/Guenael/rtlsdr-wsprd) ![LGTM Grade](https://img.shields.io/lgtm/grade/cpp/github/Guenael/rtlsdr-wsprd) ```
Guenael · Oct 12, 2024 · 83f9ec5 · 83f9ec5
1 parent 66777ae
commit 83f9ec5
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diff --git a/README.md b/README.md
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 ![Workflow Status](https://img.shields.io/github/workflow/status/Guenael/rtlsdr-wsprd/CI)
 ![Last commit](https://img.shields.io/github/last-commit/Guenael/rtlsdr-wsprd)
 ![Commit activity](https://img.shields.io/github/commit-activity/m/Guenael/rtlsdr-wsprd)
-![LGTM Alerts](https://img.shields.io/lgtm/alerts/github/Guenael/rtlsdr-wsprd)
-![LGTM Grade](https://img.shields.io/lgtm/grade/cpp/github/Guenael/rtlsdr-wsprd)
 
 ## TL;DR