remove downstream CI

.github/workflows/ci.yml

@@ -1,24 +0,0 @@
-name: CI
-
-on: [push, pull_request]
-
-jobs:
-  test:
-    runs-on: ${{ matrix.os }}
-    strategy:
-      matrix:
-        nim: [2.2.6]
-        os: [ubuntu-latest, macOS-latest, windows-latest]
-    steps:
-    - uses: actions/checkout@v2
-    - name: Install Nim
-      uses: jiro4989/setup-nim-action@v2
-      with:
-        nim-version: ${{ matrix.nim }}
-        repo-token: ${{ secrets.GITHUB_TOKEN }}
-    - name: Install dependencies
-      run: nimble install -d -y
-    - name: Test
-      run: nimble test -y
-    - name: Build binary
-      run: nimble build -y