fix start script and add update command

README.md

@@ -49,12 +49,18 @@ git clone https://github.com/Alfresco/dev-platform-webcomponents.git
 cd dev-platform-webcomponents
 ```
 
-* Start the demo and Install all the dependencies (do it the first time or after a project update)
+* Start the demo and Install all the dependencies (do it the first time)
 
 ```sh
 ./start.sh -install
 ```
 
+* Start the demo and update the dependencies
+
+```sh
+./start.sh -update
+```
+
 * Start the demo 
 
 ```sh

start.sh

@@ -3,7 +3,11 @@ cd demo-shell-ng2
 
 #!/bin/sh
 if  [[ $1 = "-install" ]]; then
+    npm install
+    npm run start
+elif  [[ $1 = "-update " ]]; then
+    npm run update
     npm run start
 else
-    npm run start.dev
+    npm run start
 fi