[librsvg] README.md: Link to the other GUADEC presentation on librsvg

[Federico Mena Quintero <federico src gnome org>]

commit 2d8ec15a2f6e555c59bdca9f112c2819810536d9
Author: Federico Mena Quintero <federico gnome org>
Date:   Fri Feb 15 08:56:17 2019 -0600

    README.md: Link to the other GUADEC presentation on librsvg

 README.md | 11 +++++++++--
 1 file changed, 9 insertions(+), 2 deletions(-)
---
diff --git a/README.md b/README.md
index 65337cb5..f0e8327e 100644
--- a/README.md
+++ b/README.md
@@ -128,10 +128,16 @@ Presentations on librsvg
 ------------------------
 
 "[Replacing C library code with Rust: What I learned with
-librsvg][guadec-presentation]" was presented at GUADEC 2017.  It gives
+librsvg][guadec-presentation-1]" was presented at GUADEC 2017.  It gives
 a little history of librsvg, and how/why it is being ported to Rust
 from C.
 
+"[Patterns of refactoring C to Rust: the case of
+librsvg][guadec-presentation-2]" was presented at GUADEC 2018.  It
+describes ways in which librsvg's C code was refactored to allow
+porting it to Rust.
+
+
 Maintainers
 -----------
 
@@ -163,4 +169,5 @@ ways:
 [d-d-l]: https://mail.gnome.org/mailman/listinfo/desktop-devel-list
 [federico]: https://people.gnome.org/~federico/
 [platform]: https://developer.gnome.org/
-[guadec-presentation]: https://people.gnome.org/~federico/blog/docs/fmq-porting-c-to-rust.pdf
+[guadec-presentation-1]: https://people.gnome.org/~federico/blog/docs/fmq-porting-c-to-rust.pdf
+[guadec-presentation-2]: https://people.gnome.org/~federico/blog/docs/fmq-refactoring-c-to-rust.pdf