fix Cache-Control in sapper

package-lock.json

@@ -8102,7 +8102,7 @@
       }
     },
     "sapper": {
-      "version": "github:nolanlawson/sapper#ec86bbb81d6b7346d3332b3d31fd507a01010f2f",
+      "version": "github:nolanlawson/sapper#701bc3455a9387d76f8047e7152c8295c9516788",
       "requires": {
         "chalk": "2.3.2",
         "chokidar": "1.7.0",

package.json

@@ -53,7 +53,7 @@
     "pify": "^3.0.0",
     "quick-lru": "^1.1.0",
     "requestidlecallback": "^0.3.0",
-    "sapper": "nolanlawson/sapper#monkey-patches",
+    "sapper": "github:nolanlawson/sapper#monkey-patches",
     "serve-static": "^1.13.1",
     "standard": "^10.0.3",
     "stringz": "^0.4.0",

server.js

@@ -14,7 +14,11 @@ global.fetch = (url, opts) => {
 
 app.use(compression({ threshold: 0 }))
 
-app.use(serveStatic('assets'))
+app.use(serveStatic('assets', {
+  setHeaders: (res) => {
+    res.setHeader('Cache-Control', 'public,max-age=14400')
+  }
+}))
 
 app.use(sapper())