Update changelog and readme; bump version

CHANGELOG.md

@@ -7,6 +7,12 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+## [1.3.0] - 2020-02-13
+
+### Added
+
+  - Generic hugo.serverWithArgs() method to run a Hugo server with any arbitrary argument string.
+
 ## [1.2.0] - 2020-02-12
 
 ### Added

README.md

@@ -81,6 +81,8 @@ const Hugo = require('node-hugo')
 })()
 ```
 
+(Version 1.3.0+) For creating Hugo servers with an arbitrary argument string, you can use the `serverWithArgs()` method. This works like the blocking `command()` method but provides streaming output from the Hugo server.
+
 ## Maintenance
 
 ### Update Hugo binaries

package.json

 {
   "name": "@small-tech/node-hugo",
-  "version": "1.2.0",
+  "version": "1.3.0",
   "description": "A basic cross-platform interface to the Hugo binary from Node.js.",
   "main": "index.js",
   "scripts": {