👷 remove Clang 8

.github/workflows/windows_clang.yml

@@ -3,20 +3,6 @@ name: Windows
 on: [push, pull_request]
 
 jobs:
-  clang8:
-    runs-on: windows-latest
-
-    steps:
-      - uses: actions/checkout@v1
-      - name: install Clang
-        run: curl -fsSL -o LLVM8.exe https://releases.llvm.org/8.0.0/LLVM-8.0.0-win64.exe ; 7z x LLVM8.exe -y -o"C:/Program Files/LLVM"
-      - name: cmake
-        run: cmake -S . -B build -DCMAKE_CXX_COMPILER="C:/Program Files/LLVM/bin/clang++.exe" -G"MinGW Makefiles" -DCMAKE_BUILD_TYPE=Debug -DJSON_BuildTests=On
-      - name: build
-        run: cmake --build build --parallel 10
-      - name: test
-        run: cd build ; ctest -j 10 -C Debug --exclude-regex "test-unicode" --output-on-failure
-
   clang9:
     runs-on: windows-latest