Bump the VM service protocol version to 2.0.

runtime/vm/service/service.md

-# Dart VM Service Protocol 1.0 (Draft 1)
+# Dart VM Service Protocol 2.0
 
 > Please post feedback to the [observatory-discuss group][discuss-list]
 
-This document describes _draft 1_ of _version 1.0_ of the Dart VM
-Service Protocol.  This protocol is used to communicate with a running
-Dart Virtual Machine.
+This document describes of _version 2.0_ of the Dart VM Service Protocol. This
+protocol is used to communicate with a running Dart Virtual Machine.
 
 To use the Service Protocol, start the VM with the *--observe* flag.
 The VM will start a webserver which services protocol requests via WebSocket.
 It is possible to make HTTP (non-WebSocket) requests,
 but this does not allow access to VM _events_ and is not documented
 here.
 
 The Service Protocol uses [JSON-RPC 2.0][].
 
 [JSON-RPC 2.0]: http://www.jsonrpc.org/specification
@@ skipping 85 matching lines @@
 _id_ property to pair it with the corresponding request. If the RPC
 was successful, the _result_ property provides the result.
 
 Here is an example response for our [getVersion](#getversion) request above:
 
 ```
 {
   "jsonrpc": "2.0",
   "result": {
     "type": "Version",
-    "major": 1,
+    "major": 2,
     "minor": 0
   }
   "id": "1"
 }
 ```
 
 Parameters for RPC requests are always provided as _named_ parameters.
 The JSON-RPC spec provides for _positional_ parameters as well, but they
 are not supported by the Dart VM.
 
@@ skipping 169 matching lines @@
 
 ## Versioning
 
 The [getVersion](#getversion) RPC can be used to find the version of the protocol
 returned by a VM. The _Version_ response has a major and a minor
 version number:
 
 ```
   "result": {
     "type": "Version",
-    "major": 1,
+    "major": 2,
     "minor": 0
   }
 ```
 
 The major version number is incremented when the protocol is changed
 in a potentially _incompatible_ way. An example of an incompatible
 change is removing a non-optional property from a result.
 
 The minor version number is incremented when the protocol is changed
 in a _backwards compatible_ way. An example of a backwards compatible
@@ skipping 1678 matching lines @@
 ```
 
 ## Revision History
 
 version | comments
 ------- | --------
 1.0 draft 1 | initial revision
 
 
 [discuss-list]: https://groups.google.com/a/dartlang.org/forum/#!forum/observatory-discuss