Update toolchain

Author: kateinoigakukun

.swift-version

@@ -1 +1 @@
-wasm-5.2-DEVELOPMENT-SNAPSHOT-2020-03-03-a
+wasm-DEVELOPMENT-SNAPSHOT-2020-03-05-a

IntegrationTests/JavaScriptKitExec/.swift-version

@@ -2,10 +2,19 @@ MAKEFILE_DIR := $(dir $(lastword $(MAKEFILE_LIST)))
 WASI_SDK_DIR ?= $(MAKEFILE_DIR)/.wasi-sdk
 WASI_SYSROOT ?= $(WASI_SDK_DIR)/share/wasi-sysroot
 
+.PHONY: bootstrap
+bootstrap:
+	cd Runtime && npm install
+
+.PHONY: build
 build: .wasi-sdk/dummy
 	./script/build-package.sh $(WASI_SYSROOT)
+	cd Runtime && npm run build
+
+.PHONY: test
+test: build
+	cd IntegrationTests && make test
+
 .wasi-sdk/dummy:
 	./script/install-wasi-sdk.sh $(WASI_SDK_DIR)
 	touch .wasi-sdk/dummy
-test:
-	cd IntegrationTests && make test