Add post install step to package.json to update typings

Author: mhegazy

jsx/README.md

@@ -8,11 +8,6 @@ A demo project for showing off JSX in TypeScript
 npm install
 ```
 
-## Update typeings
-```
-node node_modules\.bin\tsd update
-```
-
 ## Compile
 ```
 node node_modules/typescript/bin/tsc

jsx/package.json

@@ -4,7 +4,8 @@
     "description": "JSX in TypeScript Demo Project",
     "main": "app.js",
     "scripts": {
-        "test": "echo \"Error: no test specified\" && exit 1"
+        "test": "echo \"Error: no test specified\" && exit 1",
+        "postinstall": "node_modules/.bin/tsd update"
     },
     "repository": {
         "type": "git",