Update README.md for final version

I’ve printed the document, and while it hasn’t been bound, signed, or
handed in yet, that’s final enough that I can start to prepare the
digital publication as well.

README.md

@@ -1,14 +1,12 @@
 # Master’s thesis
 
 This is where the text of my master’s thesis lives.
-It’s not done yet, but I’m getting there (the deadline is October 15th).
-If you want to give me feedback,
-[a recent-ish PDF version][pdf] is available,
-though it may not always be completely up-to-date with the latest changes to the TeX source.
+You can find the source code of the version I handed in under the `final` tag,
+and the built PDF is available on the [release page][final-release].
 
 ## License
 
 This work is licensed under a [Creative Commons “Attribution 4.0 International”][cc by 4.0] license.
 
-[pdf]: https://github.com/lucaswerkmeister/master-thesis/blob/pdf/thesis.pdf
+[final-release]: https://github.com/lucaswerkmeister/master-thesis/releases/tag/final
 [cc by 4.0]: https://creativecommons.org/licenses/by/4.0/