bump rust version

Author: sfackler

.circleci/config.yml

@@ -1,45 +1,42 @@
 restore_registry: &RESTORE_REGISTRY
   restore_cache:
     key: registry
-
 save_registry: &SAVE_REGISTRY
   save_cache:
     key: registry-{{ .BuildNum }}
     paths:
-      - /usr/local/cargo/registry/index
-
+    - /usr/local/cargo/registry/index
 deps_key: &DEPS_KEY
-  key: deps-1.19.0-{{ checksum "Cargo.lock" }}
-
+  key: deps-{{ checksum "~/rust-version" }}-{{ checksum "Cargo.lock" }}
 restore_deps: &RESTORE_DEPS
   restore_cache:
     <<: *DEPS_KEY
-
 save_deps: &SAVE_DEPS
   save_cache:
     <<: *DEPS_KEY
     paths:
-      - target
-      - /usr/local/cargo/registry/cache
+    - target
+    - /usr/local/cargo/registry/cache
 
 version: 2
 jobs:
   build:
     working_directory: ~/build
     docker:
-      - image: rust:1.20.0
+      - image: rust:1.21.0
         environment:
           RUSTFLAGS: -D warnings
       - image: sfackler/rust-postgres-test:3
     steps:
       - checkout
       - run: apt-get update
       - run: DEBIAN_FRONTEND=noninteractive apt-get install -y --no-install-recommends jq
-      - <<: *RESTORE_REGISTRY
+      - *RESTORE_REGISTRY
       - run: cargo generate-lockfile
-      - <<: *SAVE_REGISTRY
-      - <<: *RESTORE_DEPS
+      - *SAVE_REGISTRY
+      - run: rustc --version > ~/rust-version
+      - *RESTORE_DEPS
       - run: cargo test --all
       - run: cargo test --manifest-path=postgres/Cargo.toml --features "$(cargo read-manifest --manifest-path=postgres/Cargo.toml | jq -r '.features|keys|map(select(. != "with-security-framework" and . != "with-schannel"))|join(" ")')"
       - run: cargo test --manifest-path=tokio-postgres/Cargo.toml --all-features
-      - <<: *SAVE_DEPS
+      - *SAVE_DEPS