re-enable stable & beta

Author: G8XSU

.github/workflows/build.yml

@@ -6,7 +6,7 @@ jobs:
   build:
     strategy:
       matrix:
-        toolchain: [ 1.63.0 ] # 1.63.0 is current MSRV for vss-client
+        toolchain: [ stable, beta, 1.63.0 ] # 1.63.0 is current MSRV for vss-client
         include:
           - toolchain: stable
             check-fmt: true