[added] doc for react 0.14 + old 0.13

- also added the version for google ReCaptcha (v2) closes dozoisch#4

Author: dozoisch

README.md

@@ -5,14 +5,20 @@
 [![Dependencies][deps.img]][deps.url]
 [![Dev Dependencies][devdeps.img]][devdeps.url]
 
-Component wrapper for [Google reCAPTCHA][reCAPTCHA]
+Component wrapper for [Google reCAPTCHA v2][reCAPTCHA]
 
 ## Installation
 
 ```shell
 npm install --save react-google-recaptcha
 ```
 
+### React 0.13
+With 0.13, install version 0.4.0
+```shell
+npm install --save [email protected]
+```
+
 ## Usage
 
 All you need to do is [sign up for an API key pair][signup]. You will need the client key.
@@ -21,18 +27,21 @@ You can then use the reCAPTCHA. The default require, imports a wrapped component
 
 ```jsx
 var React = require("react");
+var render = require("react-dom").render
 var ReCAPTCHA = require("react-google-recaptcha");
 
 function onChange(value) {
   console.log("Captcha value:", value);
 }
 
-React.render(
-<ReCAPTCHA
-  ref="recaptcha"
-  sitekey="Your client site key"
-  onChange={onChange}
-/>, document.body);
+render(
+    <ReCAPTCHA
+      ref="recaptcha"
+      sitekey="Your client site key"
+      onChange={onChange}
+    />, 
+    document.body
+);
 ```
 
 ### Rendering Props
@@ -61,6 +70,7 @@ You can also use the barebone components doing the following. Using that compone
 
 ```jsx
 var React = require("react");
+var render = require("react-dom").render
 var ReCAPTCHA = require("react-google-recaptcha/lib/recaptcha");
 
 var grecaptchaObject = grecaptcha // You must provide access to the google grecaptcha object.
@@ -69,24 +79,17 @@ function onChange(value) {
   console.log("Captcha value:", value);
 }
 
-React.render(
-<ReCAPTCHA
-  ref="recaptcha"
-  sitekey="Your client site key"
-  onChange={onChange}
-  grecaptcha={grecaptchaObject}
-/>, document.body);
+render(
+    <ReCAPTCHA
+      ref="recaptcha"
+      sitekey="Your client site key"
+      onChange={onChange}
+      grecaptcha={grecaptchaObject}
+    />, 
+    document.body
+);
 ```
 
-
-
-## To Come Soon
-- tests
-- examples
-- code coverage
-
-*The build is highly inspired by [react-bootstrap][rb]*
-
 [travis.img]: https://travis-ci.org/dozoisch/react-google-recaptcha.svg?branch=master
 [travis.url]: https://travis-ci.org/dozoisch/react-google-recaptcha
 [npm.img]: https://badge.fury.io/js/react-google-recaptcha.svg