Bump rust nightly to 2020-08-17

Author: mvines

ci/docker-rust-nightly/README.md

@@ -20,7 +20,7 @@ To update the pinned version:
    specific YYYY-MM-DD that is desired (default is today's build).
    Check https://rust-lang.github.io/rustup-components-history/ for build
    status
-1. Update `ci/rust-version.sh` to reflect the new nightly `YYY-MM-DD`
+1. Update `ci/rust-version.sh` to reflect the new nightly `YYYY-MM-DD`
 1. Run `SOLANA_ALLOCATE_TTY=1 SOLANA_DOCKER_RUN_NOSETUID=1 ci/docker-run.sh --nopull solanalabs/rust-nightly:YYYY-MM-DD ci/test-checks.sh`
    and `SOLANA_ALLOCATE_TTY=1 SOLANA_DOCKER_RUN_NOSETUID=1 ci/docker-run.sh --nopull solanalabs/rust-nightly:YYYY-MM-DD ci/test-coverage.sh [args]...`
    to confirm the new nightly image builds.  Fix any issues as needed

ci/rust-version.sh

@@ -24,7 +24,7 @@ fi
 if [[ -n $RUST_NIGHTLY_VERSION ]]; then
   nightly_version="$RUST_NIGHTLY_VERSION"
 else
-  nightly_version=2020-07-27
+  nightly_version=2020-08-17
 fi