changement version node 6.x

Makefile

@@ -11,7 +11,7 @@ all: build
 build:
 	apt-get update
 	apt-get install --yes --no-install-recommends curl ca-certificates
-	curl --silent --location https://deb.nodesource.com/setup_0.12 | bash -
+	curl --silent --location https://deb.nodesource.com/setup_6.x | bash -
 	apt-get install --yes nodejs
 	npm install --ignore-scripts
 	ARCH=$(ELECTRON_ARCH) npm run build