[skip ci] some updates

.github/workflows/building.yml

@@ -4,13 +4,14 @@ on: [workflow_dispatch]
 
 jobs:
 
-  bdist_wheel:
+  wheel:
     runs-on: ${{ matrix.os }}
 
     strategy:
       fail-fast: false
       matrix:
-        os: [ubuntu-18.04, macos-10.15, windows-latest]
+        # os: [ubuntu-18.04, macos-10.15, windows-latest]
+        os: [windows-latest]
         python-version: [3.6, 3.7, 3.8, 3.9]
         torch-version: [1.8.0, 1.9.0]
         cuda-version: ['cpu', 'cu101', 'cu102', 'cu111']
@@ -53,17 +54,19 @@ jobs:
       - name: Install main package for CPU
         if: ${{ matrix.cuda-version == 'cpu' }}
         run: |
-          export FORCE_ONLY_CPU=1
           pip install -e .
           ls -lah torch_scatter/
+        env:
+          FORCE_ONLY_CPU: 1
 
       - name: Install main package with CUDA
         if: ${{ matrix.cuda-version != 'cpu' }}
         run: |
           ./.github/workflows/cuda/${{ matrix.cuda-version }}-${{ runner.os }}-env.sh
-          export FORCE_CUDA=1
           pip install -e .
           ls -lah torch_scatter/
+        env:
+          FORCE_CUDA: 1
 
       - name: Build wheel
         run: |