fix ci and documents to use new script

.github/workflows/cron-ci.yaml

@@ -83,8 +83,8 @@ jobs:
         run: cargo build --release --verbose
       - name: Collect what is left data
         run: |
-          chmod +x ./whats_left.sh
-          ./whats_left.sh > whats_left.temp
+          chmod +x ./whats_left.py
+          ./whats_left.py > whats_left.temp
         env:
           RUSTPYTHONPATH: ${{ github.workspace }}/Lib
       - name: Upload data to the website

README.md

@@ -198,7 +198,7 @@ To enhance CPython compatibility, try to increase unittest coverage by checking
 Another approach is to checkout the source code: builtin functions and object
 methods are often the simplest and easiest way to contribute.
 
-You can also simply run `./whats_left.sh` to assist in finding any unimplemented
+You can also simply run `./whats_left.py` to assist in finding any unimplemented
 method.
 
 ## Compiling to WebAssembly