fix a broken pip command reference in CONTRIBUTING.md

pkucmus · pkucmus · commit 0cc4e7b2f63c · 2021-09-15T20:14:01.000+02:00
diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
@@ -31,7 +31,7 @@ virtualenv gql-dev
 Activate the virtualenv and install dependencies by running:
 
 ```console
-python pip install -e.[dev]
+python -m pip install -e.[dev]
 ```
 
 If you are using Linux or MacOS, you can make use of Makefile command
