fix: update pip installation command in README

pH-7 · pH-7 · commit 6f7575a76fe9 · 2026-03-16T08:31:42.000+11:00
diff --git a/README.md b/README.md
@@ -199,6 +199,7 @@ make install
 # or manually:
 python3 -m venv .venv
 source .venv/bin/activate
+pip install --upgrade pip
 pip install -r requirements.txt
 ```
 
