Dropping it.

.github/workflows/vs15-ci.yml

diff --git a/.github/workflows/vs15-ci.yml b/.github/workflows/vs15-ci.yml
deleted file mode 100644
index b611eed..0000000
--- a/.github/workflows/vs15-ci.yml
+++ /dev/null
@@ -1,29 +0,0 @@
-name: VS15-CI
-
-on: [push, pull_request]
-
-jobs:
-  ci:
-    if: >-
-      ! contains(toJSON(github.event.commits.*.message), '[skip ci]') &&
-      ! contains(toJSON(github.event.commits.*.message), '[skip github]')
-    name: windows-vs15
-    runs-on: windows-latest
-    strategy:
-      fail-fast: false
-      matrix:
-        include:
-          - {gen: Visual Studio 15 2017, arch: Win32}
-          - {gen: Visual Studio 15 2017, arch: x64}
-    steps:
-    - uses: actions/checkout@v2
-    - name: Configure
-      run: |
-          mkdir build
-          cd build && cmake  -G "${{matrix.gen}}" -A ${{matrix.arch}} -DFASTFLOAT_TEST=ON ..
-    - name: Build
-      run: cmake --build build --verbose --config Release --parallel
-    - name: 'Run CTest'
-      run: |
-          cd build
-          ctest -C Release --output-on-failure -R basictest
\ No newline at end of file