fix circup instruction

FoamyGuy · FoamyGuy · commit 3ee2174e6ec7 · 2024-02-26T11:19:45.000-06:00
diff --git a/README.rst b/README.rst
@@ -83,7 +83,7 @@ following command to install:
 
 .. code-block:: shell
 
-    circup install adafruit-circuitpython-pcf8575
+    circup install adafruit_pcf8575
 
 Or the following command to update an existing version:
 
