Update Bibliography to 1.9: Fix a typo in an hyperlink

Author: tatsuya6502

1.9/ja/book/bibliography.md

@@ -142,5 +142,5 @@
 * [Session Types for Rust](http://munksgaard.me/papers/laumann-munksgaard-larsen.pdf)
   — Philip Munksgaardの修士論文。Servoのための研究
 * [Ownership is Theft: Experiences Building an Embedded OS in Rust - Amit Levy, et. al.](http://amitlevy.com/papers/tock-plos2015.pdf)
-* [You can't spell trust without Rust](https://raw.githubusercontent.com/Gankro/thesis/master/thesis.PD)
+* [You can't spell trust without Rust](https://raw.githubusercontent.com/Gankro/thesis/master/thesis.pdf)
   — Alexis Beingessnerの修士論文