Add support for "Get Contacts by Emails" endpoint

- Add missing endpoint support
- Fix typos in CONTRIBUTING.md example

CONTRIBUTING.md

@@ -1,4 +1,4 @@
-Hello! Thank you for choosing to help contribute to one of the SendGrid open source projects. There are many ways you can contribute and help is always welcome.  We merely ask that you follow the following contribution policies.
+Hello! Thank you for choosing to help contribute to one of the SendGrid open source projects. There are many ways you can contribute and help is always welcome. We merely ask that you follow the following contribution policies.
 
 - [Improvements to the Codebase](#improvements-to-the-codebase)
 - [Understanding the Code Base](#understanding-the-codebase)
@@ -61,7 +61,7 @@ An HTTP client with a fluent interface using method chaining and reflection. By
 
 This allows for the following mapping from a URL to a method chain:
 
-`/api_client/{api_key_id}/version` maps to `client->api_client().->_($api_key_id)->version-><method>()` where <method> is a [HTTP verb](lib/Client.php#L210).
+`/api_client/{api_key_id}/version` maps to `$client->api_client()->_($api_key_id)->version-><method>()` where <method> is a [HTTP verb](lib/Client.php#L210).
 
 **/lib/SendGrid/Config.php**
 
@@ -149,4 +149,4 @@ Please run your code through:
 
 <a name="code-reviews"></a>
 ## Code Reviews
-If you can, please look at open PRs and review them. Give feedback and help us merge these PRs much faster! If you don't know how, Github has some great [information on how to review a Pull Request](https://help.github.com/articles/about-pull-request-reviews/).
+If you can, please look at open PRs and review them. Give feedback and help us merge these PRs much faster! If you don't know how, Github has some great [information on how to review a Pull Request](https://help.github.com/articles/about-pull-request-reviews/).

lib/Client.php

@@ -66,6 +66,7 @@
  * Marketing
  * @method Client marketing()
  * @method Client contacts()
+ * @method Client emails()
  * @method Client count()
  * @method Client exports()
  * @method Client imports()
@@ -650,4 +651,4 @@ public function __call($name, $args)
 
         return $this->_($name);
     }
-}
+}