add bunyan-prettystream definition.

bunyan-prettystream/bunyan-prettystream.d.ts

@@ -0,0 +1,13 @@
+// type definitions for bunyan-prettystream
+// project: https://www.npmjs.com/package/bunyan-prettystream
+// definitions by jasons@novaleaf.com
+
+/// <reference path="../../node/node.d.ts" />
+
+declare module "bunyan-prettystream" {
+	import stream = require("stream");
+	class PrettyStream extends stream.Writable {
+		public pipe<T extends NodeJS.WritableStream>(destination: T, options?: { end?: boolean; }): T;
+	}
+	export = PrettyStream;
+}