Bump version to 1.67, and update CHANGELOG

CHANGELOG.md

@@ -1,8 +1,14 @@
-(unreleased)
-
-- Converted the code base from coffeescript to Javascript, to allow more developers to work on Vimium. This
-  has likely introduced small bugs, so if you see one, please file them
-  [here](https://github.com/philc/vimium/issues).
+1.67 (2021-07-09)
+
+- Dark mode: Vimium's UI (URL bar, help dialog, option page, etc.) are dark if the browser is configured for
+  dark mode. Vimium's dark mode is also compatible when using the popular
+  [DarkReader extension](https://github.com/darkreader/darkreader).
+- Convert the code base from Coffeescript to Javascript, to simplify the dev experience and allow more
+  developers to work on Vimium.
+- Make search mode work in newer versions of Firefox (#3801)
+- Make buttons on the Vimium options page work again in newer versions of Firefox (#3624)
+- Allow Vimium to work in LibreWolf (a Firefox fork)
+- Fixes to visual mode (#3568, #3779)
 
 1.66 (2020-03-02)
 

manifest.json

@@ -1,7 +1,7 @@
 {
   "manifest_version": 2,
   "name": "Vimium",
-  "version": "1.66",
+  "version": "1.67",
   "description": "The Hacker's Browser. Vimium provides keyboard shortcuts for navigation and control in the spirit of Vim.",
   "icons": {  "16": "icons/icon16.png",
               "48": "icons/icon48.png",