Bump version to 1.5.0

While we didn't add extra features, I feel like the new composeWindow
resizing is quite a significant improvement from a UX perspective.

package.json

@@ -1,7 +1,7 @@
 {
   "name": "WIP",
   "description": "Menubar app for WIP",
-  "version": "1.4.7",
+  "version": "1.5.0",
   "author": "Marc Köhlbrugge <[email protected]>",
   "bugs": {
     "url": "https://github.com/marckohlbrugge/wip-menubar/issues"