added release notes for 0.12.9
added release notes for 0.12.9

Auditors: 3b7c71ee0e5cc446e346f75e333ddae4d394475d@luixxiul

luixxiul/browser-laptop,willy-b/browser-laptop,darkdh/browser-laptop,luixxiul/browser-laptop,pmkary/braver,diasdavid/browser-laptop,darkdh/browser-laptop,jonathansampson/browser-laptop,timborden/browser-laptop,willy-b/browser-laptop,timborden/browser-laptop,willy-b/browser-laptop,diasdavid/browser-laptop,darkdh/browser-laptop,pmkary/braver,timborden/browser-laptop,darkdh/browser-laptop,timborden/browser-laptop,pmkary/braver,dcposch/browser-laptop,jonathansampson/browser-laptop,luixxiul/browser-laptop,pmkary/braver,luixxiul/browser-laptop,dcposch/browser-laptop,jonathansampson/browser-laptop,dcposch/browser-laptop,dcposch/browser-laptop,diasdavid/browser-laptop,diasdavid/browser-laptop,willy-b/browser-laptop,jonathansampson/browser-laptop