fix: use rust nightly image for drone CI

sunnygleason · sunnygleason · commit 6b970872299d · 2019-08-15T13:47:43.000-04:00
diff --git a/.drone.yml b/.drone.yml
@@ -56,7 +56,7 @@ platform:
 
 steps:
 - name: test
-  image: rust:1
+  image: rustlang/rust:nightly
   commands:
   - cargo +nightly build --verbose --all
   - cargo +nightly test --verbose --all
