Upgrade to Rust 1.32.0

$ rustup update stable

ci/buildkite.yml

@@ -2,7 +2,7 @@ steps:
   - command: "ci/shellcheck.sh"
     name: "shellcheck"
     timeout_in_minutes: 20
-  - command: "ci/docker-run.sh solanalabs/rust:1.31.0 ci/test-checks.sh"
+  - command: "ci/docker-run.sh solanalabs/rust:1.32.0 ci/test-checks.sh"
     name: "checks"
     timeout_in_minutes: 30
   - wait
@@ -14,7 +14,7 @@ steps:
   - command: "ci/test-bench.sh"
     name: "bench"
     timeout_in_minutes: 30
-  - command: "ci/docker-run.sh solanalabs/rust:1.31.0 ci/test-stable.sh"
+  - command: "ci/docker-run.sh solanalabs/rust:1.32.0 ci/test-stable.sh"
     name: "stable"
     timeout_in_minutes: 40
   - command: "ci/docker-run.sh solanalabs/rust-nightly:2019-01-31 ci/test-coverage.sh"

ci/docker-rust/Dockerfile

@@ -1,6 +1,6 @@
 # Note: when the rust version is changed also modify
 # ci/buildkite.yml to pick up the new image tag
-FROM rust:1.31.0
+FROM rust:1.32.0
 
 RUN set -x \
  && apt update \

ci/version-check.sh

@@ -25,8 +25,8 @@ nightly)
   require cargo 1.34.[0-9]+-nightly +nightly
   ;;
 stable)
-  require rustc 1.31.[0-9]+
-  require cargo 1.31.[0-9]+
+  require rustc 1.32.[0-9]+
+  require cargo 1.32.[0-9]+
   ;;
 *)
   echo Error: unknown argument: "$1"