Update README.md

ruby/README.md

@@ -1,26 +1,26 @@
-gRPC Ruby Helloworld
-====================
+gRPC in 3 minutes (Ruby)
+========================
 
-INSTALLATION PREREQUISITES
---------------------------
+PREREQUISITES
+-------------
 
-This requires Ruby 2.x, as the gRPC API surface uses keyword args.
+This requires Ruby 2.1, as the gRPC API surface uses keyword args.
 
 INSTALL
 -------
 
 - Clone this repository.
 - Follow the instructions in [INSTALL](https://github.com/grpc/grpc/blob/master/INSTALL) to install the gRPC C core.
-- *Temporary* Install gRPC for Ruby from source on your local machine and update path: to refer to it [Gemfile].
-  - this is needed until the gRPC ruby gem is published
+- *Temporary* Install the full gRPC distribution from source on your local machine and update path: in [Gemfile] to refer src/ruby within it.
+  - this is necessary until the gRPC ruby gem is published
 - Use bundler to install
 ```sh
 $ # from this directory
 $ gem install bundler && bundle install
 ```
 
-USAGE
------
+Try it! 
+-------
 
 - Run the server
 ```sh