ci: consistent spacing in ci yaml.

Author: cpu

.github/workflows/ci.yml

@@ -25,7 +25,6 @@ jobs:
     - name: Run cargo doc
       run: cargo doc --all --all-features
 
-
   build:
     strategy:
       matrix:
@@ -38,9 +37,7 @@ jobs:
             toolchain: nightly
           - os: macOS-latest
             toolchain: stable 7 months ago
-
     runs-on: ${{ matrix.os }}
-
     steps:
     - uses: actions/checkout@master
     - name: Install Rust