Add MSRV 1.63 to CI

Author: jayvdb

.github/workflows/ci.yml

@@ -18,7 +18,7 @@ jobs:
     strategy:
       matrix:
         os: [ubuntu-latest, windows-latest, macOS-latest]
-        rust: [nightly, beta, stable]
+        rust: [nightly, beta, stable, 1.63]
 
     steps:
     - uses: actions/checkout@v3