Update gridfm-datakit installation command

Updated installation command for gridfm-datakit to the latest version.

Signed-off-by: PUECH Alban <72336171+albanpuech@users.noreply.github.com>

Author: albanpuech

README.md

@@ -28,7 +28,7 @@ This library is brought to you by the GridFM team to generate power flow data to
 
     ```bash
     python -m pip install --upgrade pip  # Upgrade pip
-    pip install gridfm-datakit==0.0.9a0
+    pip install gridfm-datakit
     ```
 
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