Updates

README.md

@@ -17,6 +17,8 @@ execute:
     npm install
     nodejs pixdisp.js
 
+optionally npm install pi-spi jpeg-js mjpeg-server
+
 Navigate to http://localhost:8080/
 
 Matrix driver & Unicorn Hat HD driver inspired by https://github.com/vesteraas/node-unicornhathd

package.json

@@ -7,17 +7,19 @@
   },
   "license": "MIT",
   "dependencies": {
-    "jpeg-js": "^0.3.4",
-    "mjpeg-server": "^0.3.0",
-    "pi-spi": "^1.0.3",
     "restify": "^6.4.0",
-    "vm2": "^3.6.10",
-    "snyk": "^1.192.0"
+    "vm2": "^3.6.10"
   },
   "devDependencies": {
     "eslint": "^4.19.1",
     "eslint-plugin-security": "^1.4.0",
-    "jest": "^22.4.4"
+    "jest": "^24.8.0",
+    "snyk": "^1.197.0"
+  },
+  "optionalDependencies": {
+    "pi-spi": "^1.0.3",
+    "jpeg-js": "^0.3.4",
+    "mjpeg-server": "^0.3.0"
   },
   "scripts": {
     "test": "jest --forceExit",