Add announcer script

I always keep writing up this same announcement message whenever I publish a new version.

I've now written a script to automate my announcement formatting, it looks like this:

```
**MetaMask 2.13.2** now published to the Chrome Store! It should be available over the next hour!
 2016-10-4

- Fix bug where chosen FIAT exchange rate does no persist when switching networks
- Fix additional parameters that made MetaMask sometimes receive errors from Parity.
- Fix bug where invalid transactions would still open the MetaMask popup.
```

1 files changed, 12 insertions, 0 deletions

diff --git a/development/announcer.js b/development/announcer.js
new file mode 100644
index 000000000..8939244d3
--- /dev/null
+++ b/development/announcer.js
@@ -0,0 +1,12 @@
+var manifest = require('../app/manifest.json')
+var version = manifest.version
+
+var fs = require('fs')
+var path = require('path')
+var changelog = fs.readFileSync(path.join(__dirname, '..', 'CHANGELOG.md')).toString()
+
+var log = changelog.split(version)[1].split('##')[0].trim()
+
+let msg = `**MetaMask ${version}** now published to the Chrome Store! It should be available over the next hour!\n${log}`
+
+console.log(msg)