docs: add thanks.dev to the funding options

Author: wolph

.github/FUNDING.yml

@@ -1,3 +1,4 @@
 github: wolph
 ko_fi: wolph_gh
+thanks_dev: u/gh/wolph
 tidelift: pypi/progressbar2

README.md

@@ -417,4 +417,7 @@ progressbar2 is maintained by [Rick van Hattem](https://github.com/wolph) in his
 If it saved you an afternoon, a tip covers an hour of issue triage:
 [Ko-fi](https://ko-fi.com/wolph_gh) or [GitHub Sponsors](https://github.com/sponsors/wolph).
 
+If your company funds its dependencies, this package is on
+[thanks.dev](https://thanks.dev/u/gh/wolph).
+
 [![ko-fi](https://ko-fi.com/img/githubbutton_sm.svg)](https://ko-fi.com/wolph_gh)

docs/sponsor.rst

@@ -12,6 +12,8 @@ If the package saved you an afternoon, a tip covers an hour of issue triage.
 
 - `Ko-fi <https://ko-fi.com/wolph_gh>`_ for a one-off tip
 - `GitHub Sponsors <https://github.com/sponsors/wolph>`_ for a recurring one
+- `thanks.dev <https://thanks.dev/u/gh/wolph>`_ if your employer funds its
+  dependency tree
 
 Nothing here buys a response time or a support contract. It buys hours on the
 parts of the package nobody else wants to look at.