diff --git a/Cargo.toml b/Cargo.toml
index 2a7056b..69b7a64 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -8,12 +8,12 @@ edition = "2018"
 [lib]
 crate-type = ["cdylib"]
 
+
 [dependencies]
-seed = "^0.1.8"
+seed = "^0.1.12"
 wasm-bindgen = "^0.2.29"
 web-sys = "^0.3.6"
 
 # For serialization, eg sending requests to a server. Otherwise, not required.
-serde = "^1.0.80"
-serde_derive = "^1.0.80"
-serde_json = "1.0.33"
\ No newline at end of file
+serde = { version = "^1.0.80", features = ['derive'] }
+serde_json = "^1.0.33"
\ No newline at end of file
diff --git a/README.md b/README.md
index d3d00f1..b1c7792 100644
--- a/README.md
+++ b/README.md
@@ -11,10 +11,18 @@
 
 `cargo install wasm-bindgen-cli`
 
+If you run into errors while installing `wasm-bindgen-cli`, you may need to install a C++
+build chain. On linux, run `sudo apt install build-essential`. On Windows, download and install
+[Visual Studio 2017](https://visualstudio.microsoft.com/downloads/); when asked in the installer,
+include the C++ workload.
+
  - Run `build.sh` or `build.ps1`, then then start a dev server that supports WASM.
 For example, with [Python](https://www.python.org/downloads/) installed, run `python pyserve.py`.
 (Linux users may need to run `python3 serve.py`.)
 
+If you run into permission errors on `build.sh`, try this command
+to allow executing the file:`chmod +x build.sh`. If you run into persmission errors on `build.ps`, open Powershell as an administrator, and enter this command: `Set-ExecutionPolicy RemoteSigned`.
+
 Once you rename the crate in `Cargo.toml` (The `name` field under `[Package]`), make the 
 following changes:
 
diff --git a/serve.py b/serve.py
index bae62e9..9506a59 100644
--- a/serve.py
+++ b/serve.py
@@ -1,13 +1,27 @@
 #!/usr/bin/env python3
 
-# From https://gist.github.com/prideout/09af26cef84eef3e06a1e3f20a499a48
-
 import http.server
+import os
 import socketserver
+import urllib
 
 PORT = 8000
 
-handler = http.server.SimpleHTTPRequestHandler
+
+class Handler(http.server.SimpleHTTPRequestHandler):
+    # Allow SPA routing by redirecting subpaths.
+    def do_GET(self):
+        urlparts = urllib.parse.urlparse(self.path)
+        request_file_path = urlparts.path.strip('/')
+
+        if not os.path.exists(request_file_path):
+            self.path = 'index.html'
+
+        return http.server.SimpleHTTPRequestHandler.do_GET(self)
+
+
+handler = Handler
+# Add support for the WASM mime type.
 handler.extensions_map.update({
     '.wasm': 'application/wasm',
 })
@@ -16,4 +30,4 @@ socketserver.TCPServer.allow_reuse_address = True
 with socketserver.TCPServer(("", PORT), handler) as httpd:
     httpd.allow_reuse_address = True
     print("Serving at port", PORT)
-    httpd.serve_forever()
\ No newline at end of file
+    httpd.serve_forever()
diff --git a/src/lib.rs b/src/lib.rs
index 170ce97..0d41707 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -36,7 +36,7 @@ fn update(msg: Msg, model: Model) -> Model {
 
 // View
 
-fn view(model: Model) -> El<Msg> {
+fn view(app: seed::App<Msg, Model>, model: Model) -> El<Msg> {
     button![ 
         simple_ev("click", Msg::Increment), 
         format!("Hello, World × {}", model.val)