otter-browser: update to 1.0.01

Update to the latest release, and, while here, get spell checking to
work.

Change log:

1.0.01 (2019-01-01):
- some enhancements in experimental backend for QtWebEngine (Blink):
-- download dialog is now shown for tab that initiated it;
-- added support for handling requests to print page;
- many other fixes.

0.9.99 RC 12 (2018-09-01):
- QtWebEngine backend no longer uses locks for fetching feeds, links or search engines;
- some other fixes.

0.9.99 RC 11 (2018-08-01):
- reworked handling of custom icons for toolbar entries;
- some other fixes.

(gutteridge)