Update toolchain version

Author: kateinoigakukun

.github/workflows/test.yml

@@ -8,7 +8,7 @@ jobs:
         os: [macOS-10.15]
         include:
           - os: macOS-10.15
-            toolchain: https://github.com/swiftwasm/swift/releases/download/swift-wasm-DEVELOPMENT-SNAPSHOT-2020-05-10-a/swift-wasm-DEVELOPMENT-SNAPSHOT-2020-05-10-a-osx.tar.gz
+            toolchain: https://github.com/swiftwasm/swift/releases/download/swift-wasm-DEVELOPMENT-SNAPSHOT-2020-06-03-a/swift-wasm-DEVELOPMENT-SNAPSHOT-2020-06-03-a-osx.tar.gz
     runs-on: ${{ matrix.os }}
     steps:
       - name: Checkout

.swift-version

@@ -1 +1 @@
-wasm-DEVELOPMENT-SNAPSHOT-2020-05-10-a
+wasm-DEVELOPMENT-SNAPSHOT-2020-06-03-a

README.md

@@ -13,7 +13,7 @@ The toolchains can be installed via [`swiftenv`](https://github.com/kylef/swifte
 e.g.
 ```sh
 
-$ swiftenv install https://github.com/swiftwasm/swift/releases/download/swift-wasm-DEVELOPMENT-SNAPSHOT-2020-05-10-a/swift-wasm-DEVELOPMENT-SNAPSHOT-2020-05-10-a-osx.tar.gz
+$ swiftenv install https://github.com/swiftwasm/swift/releases/download/swift-wasm-DEVELOPMENT-SNAPSHOT-2020-06-03-a/swift-wasm-DEVELOPMENT-SNAPSHOT-2020-06-03-a-osx.tar.gz
 $ swift --version
 Swift version 5.3-dev (LLVM 47c28180d7, Swift 5f96d487e0)
 Target: x86_64-apple-darwin19.3.0