Update circleci rust version

Keats · boydgreenfield · commit 081e406b438c · 2020-04-16T18:10:22.000-07:00
diff --git a/.circleci/config.yml b/.circleci/config.yml
@@ -2,7 +2,7 @@ version: 2
 jobs:
   build:
     docker:
-      - image: circleci/rust:1.34
+      - image: circleci/rust:1.40
     steps:
       - checkout
       - run:
diff --git a/.gitignore b/.gitignore
@@ -1,3 +1,4 @@
 target
 Cargo.lock
 .DS_Store
+.idea/

-Original file line number
+Diff line change
@@ @@ -1,3 +1,4 @@ @@
 target
 Cargo.lock
 .DS_Store
 +.idea/