Update toolchain version swift-wasm-5.3.0-RELEASE

Author: kateinoigakukun

.github/workflows/perf.yml

@@ -16,9 +16,8 @@ jobs:
           export SWIFTENV_ROOT="$HOME/.swiftenv"
           export PATH="$SWIFTENV_ROOT/bin:$PATH"
           eval "$(swiftenv init -)"
-          swiftenv install $TOOLCHAIN_DOWNLOAD
+          make bootstrap
           make perf-tester
           node ci/perf-tester
         env:
-          TOOLCHAIN_DOWNLOAD: https://github.com/swiftwasm/swift/releases/download/swift-wasm-5.3-SNAPSHOT-2020-08-10-a/swift-wasm-5.3-SNAPSHOT-2020-08-10-a-linux.tar.gz
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}

.swift-version

@@ -1 +1 @@
-wasm-5.3-SNAPSHOT-2020-10-20-a
+wasm-5.3.0-RELEASE

README.md

@@ -119,7 +119,7 @@ Just pass a toolchain archive URL for [the latest SwiftWasm 5.3
 snapshot](https://github.com/swiftwasm/swift/releases) appropriate for your platform:
 
 ```sh
-$ swiftenv install https://github.com/swiftwasm/swift/releases/download/swift-wasm-5.3-SNAPSHOT-2020-10-20-a/swift-wasm-5.3-SNAPSHOT-2020-10-20-a-macos_x86_64.pkg
+$ swiftenv install https://github.com/swiftwasm/swift/releases/download/swift-wasm-5.3.0-RELEASE/swift-wasm-5.3.0-RELEASE-macos_x86_64.pkg
 ```
 
 You can also use the `install-toolchain.sh` helper script that uses a hardcoded toolchain snapshot: