Inserted the typographic mdash character

README.md

@@ -6,15 +6,15 @@
 This package allows you to create and evaluate JSON-RPC messages, using your own
 PHP code to evaluate the requests.
 
-This package simply abstracts away the details of the JSON-RPC messaging format:
-It allows you to create or evaluate any JSON-RPC message. It does *not*
-provide a transport layer--which you'll also need if you want to send or
+This package simply abstracts away the details of the JSON-RPC messaging format.
+It allows you to create and evaluate any JSON-RPC message. It does *not*
+provide a transport layer—which you'll also need if you want to send or
 receive messages over a distance! One of the beautiful features of JSON-RPC is
 that you can use *any* transport layer to send your messages. This package makes
-that possible!
+that possible.
 
-If you need a transport layer as well, and are looking for the complete,
-end-to-end solution, then you should use one of these packages instead:
+If you're looking for a complete, end-to-end solution—including the transport
+layer—then you should use one of these packages instead:
 * To send messages over HTTP(S), use the
 [php-json-rpc-http](https://github.com/datto/php-json-rpc-http) package.
 * To send messages over SSH, use the