Merge pull request #258 from influxdata/crepererum/fix_ci_rustup

ci: ensure toolchain is installed

Author: crepererum

.circleci/config.yml

@@ -8,6 +8,9 @@ commands:
   rust_components:
     description: Verify installed components
     steps:
+      - run:
+          name: Ensure toolchain is present
+          command: rustup toolchain install
       - run:
           name: Verify installed components
           command: |