Fix automatic changelog versioning

`npm version` will now automatically replace the text "v.next" with
the new version and the date.

CHANGELOG.md

@@ -1,7 +1,13 @@
 # Change Log
 All notable changes to this project will be documented in this file.
 
-## minor - 2016-01-18
+## v.next
+
+## Fixed
+
+- Fixed automatic changelog versioning using the wrong version
+
+## 2.1.0 - 2016-01-18
 
 ### Fixed
 

package.json

@@ -4,6 +4,7 @@
   "description": "Client-side JavaScript library for Respoke.",
   "main": "respoke/respoke.js",
   "scripts": {
+    "version": "scripts/release-changelog.sh",
     "build": "grunt build:dev",
     "watch": "webpack --watch",
     "dist": "grunt build:dist",

scripts/release-changelog.sh

@@ -0,0 +1,12 @@
+#!/bin/bash
+set -e
+# this script is automatically run by npm when issuing the `npm version`
+# command, as long as it is referenced as the "version" npm script.
+
+# Stamp the changelog
+if [ -f "CHANGELOG.md" ] && $(grep -iq "v.next" CHANGELOG.md); then
+    version=$(node -e "console.log(require('./package.json').version)")
+    echo "Applying version and date to changelog..."
+    sed -i "" -e "s/v\.next/${version} - $(date +"%Y-%m-%d")/" CHANGELOG.md
+    git add CHANGELOG.md
+fi