Fix code block syntax

README.md

@@ -2,15 +2,21 @@ This repo contains the bare minimum code to have an auto-updating Electron app u
 
 1. First, install necessary dependencies with:
 
-    npm install
+```
+npm install
+```
 
 2. Generate a GitHub access token by going to <https://github.com/settings/tokens/new>.  The access token should have the `repo` scope/permission.  Once you have the token, assign it to an environment variable (on macOS/linux):
 
-    export GH_TOKEN="<YOUR_TOKEN_HERE>"
+```
+export GH_TOKEN="<YOUR_TOKEN_HERE>"
+```
 
 3. Publish with the `publish.sh` script:
 
-    ./publish.sh
+```
+./publish.sh
+```
 
 4. Download and install the app from <https://github.com/iffy/electron-updater-example/releases>.