Update README.

Author: timburks

README.md

@@ -1,30 +1,33 @@
 [![Build Status](https://travis-ci.org/googleapis/gnostic.svg?branch=master)](https://travis-ci.org/googleapis/gnostic)
 
-# gnostic
+# ⨁ gnostic
+
+This repository contains a Go command line tool which converts
+JSON and YAML [OpenAPI](https://github.com/OAI/OpenAPI-Specification)
+descriptions to and from equivalent Protocol Buffer representations.
 
-This repository contains a Go command line tool which reads 
-[OpenAPI](https://github.com/OAI/OpenAPI-Specification) 
-descriptions in JSON or YAML formats and writes
-equivalent Protocol Buffer representations. 
 [Protocol Buffers](https://developers.google.com/protocol-buffers/)
-are a language-neutral, platform-neutral extensible mechanism 
+provide a language-neutral, platform-neutral, extensible mechanism
 for serializing structured data.
-
-**gnostic** reads OpenAPI descriptions into 
-Protocol Buffer representations, reports errors,
-resolves internal dependencies, and writes the results 
-in a binary form that can be used in any language that is 
+**gnostic**'s Protocol Buffer models for the OpenAPI Specification
+can be used to generate code that includes data structures with 
+explicit fields for the elements of an OpenAPI description.
+This makes it possible for developers to work with OpenAPI
+descriptions in type-safe ways, which is particularly useful
+in strongly-typed languages like Go and Swift.
+
+**gnostic** reads OpenAPI descriptions into
+these generated data structures, reports errors,
+resolves internal dependencies, and writes the results
+in a binary form that can be used in any language that is
 supported by the Protocol Buffer tools.
+A plugin interface simplifies integration with API
+tools written in a variety of different languages,
+and when necessary, Protocol Buffer OpenAPI descriptions
+can be reexported as JSON or YAML.
 
-Code generated by the Protocol Buffer tools includes data
-structures with explicit fields for the elements of an OpenAPI
-description. This makes it possible for developers to work
-with OpenAPI descriptions in type-safe ways. This is 
-particularly useful in strongly-typed languages like
-Go and Swift.
-
-**gnostic** compilation code and the OpenAPI Protocol Buffer
-representation are automatically generated from the 
+**gnostic** compilation code and OpenAPI Protocol Buffer
+models are automatically generated from an
 [OpenAPI JSON Schema](https://github.com/OAI/OpenAPI-Specification/blob/master/schemas/v2.0/schema.json).
 Source code for the generator is in the [generate-gnostic](generate-gnostic) directory.
 
@@ -56,7 +59,7 @@ buffers. Pre-generated versions of these files are in the OpenAPIv2 directory.
         cd ..
         generate-gnostic --v2
 
-3. [Optional] Generate protocol buffer support code. 
+3. [Optional] Generate Protocol Buffer support code. 
 A pre-generated version of this file is checked into the OpenAPIv2 directory.
 This step requires a local installation of protoc, the Protocol Buffer Compiler.
 You can get protoc [here](https://github.com/google/protobuf).