fix: drone CI rustup nightly

Author: sunnygleason

.drone.yml

@@ -56,7 +56,9 @@ platform:
 
 steps:
 - name: test
-  image: rustlang/rust:nightly
+  image: rust:1
   commands:
+  - rustup default nightly
+  - rustup update
   - cargo +nightly build --verbose --all
   - cargo +nightly test --verbose --all