Merge pull request #175 from rust-lang/nikomatsakis-patch-1

install mdbook-mermaid to fix flow chart

Author: nikomatsakis

.github/workflows/deploy.yml

@@ -5,6 +5,8 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v2
+      - name: Install mdbook-mermaid
+        run: cargo install mdbook-mermaid
       - uses: XAMPPRocky/deploy-mdbook@v1.1
         with:
             token: ${{ secrets.GITHUB_TOKEN }}