message: [docs] update README to align with openthread.io
diff: # OpenThread Border Router
  -Per the [Thread 1.1.1 Specification](http://threadgroup.org/ThreadSpec), a Border Router connects a 802.15.4 network to networks at different layers, such as WiFi or Ethernet. A Thread network requires a Border Router to connect to other networks.
  +Per the [Thread 1.1.1 Specification](http://threadgroup.org/ThreadSpec), a Thread Border Router connects a Thread network to other IP-based networks, such as Wi-Fi or Ethernet. A Thread network requires a Border Router to connect to other networks.
  A Thread Border Router minimally supports the following functions:
  @@ -15,11 +15,11 @@ OpenThread's implementation of a Border Router is called OpenThread Border Route
  - Web UI for configuration and management
  - Thread Border Agent to support an External Commissioner
  +- DHCPv6 Prefix Delegation to obtain IPv6 prefixes for a Thread network
  - NAT64 for connecting to IPv4 networks
  +- DNS64 to allow Thread devices to initiate communications by name to an IPv4-only server
  - Thread interface driver using [wpantund](https://github.com/openthread/wpantund)
  -> **Note:** This is an early MVP release of OpenThread Border Router that will be improved over time.
  -
  More information about Thread can be found at [threadgroup.org](http://threadgroup.org/). Thread is a registered trademark of the Thread Group, Inc.
  [ot-travis]: https://travis-ci.org/openthread/borderrouter
  