cirrus: update to 1.36.0 for the minimum

mathstuf · mathstuf · commit c493ed1fb5c5 · 2020-05-11T18:58:26.000-04:00
smallvec is used in testing and needs it.
diff --git a/.cirrus.yml b/.cirrus.yml
@@ -19,7 +19,7 @@ rustfmt_task:
 linux_task:
     matrix:
     - container:
-        image: rust:1.35.0
+        image: rust:1.36.0
     - container:
         image: rust:latest
     - allow_failures: true
