Add replacement speaker

_data/speakers.yml

@@ -300,4 +300,14 @@ robin-freyler:
       link: https://github.com/robbepop
   desc: |
     Robin Freyler has been developing for over a decade, with almost four of those years spent diving into Rust. He is passionate about studying programming languages, compilers, and formal methods. Before joining Parity Technologies as a Core Developer, he worked on a tool for verification of C code. He is always eager to learn more about Rust and hack on his hobby projects.
+
+neal-walfield:
+  name:  Neal Walfield
+  thumbnailUrl: neal-walfield.jpg
+  links:
+    - icon: twitter
+      link: https://twitter.com/nwalfield
+  desc: |
+    Prior to starting work on Sequoia in the fall of 2017, Neal was employed for 2.5 years by g10code to work on GnuPG. In addition to help maintain GnuPG, he implemented a new trust model, TOFU, which is based on ssh's host key checking mechanism. Neal also spent time evangelizing GnuPG by presenting his talk "An Advanced Introduction to GnuPG" across Europe and North America. Currently, Neal is employed by PEP to develop Sequoia.
+
 ---

_layouts/meta-twitter-card-generator.html

@@ -184,6 +184,7 @@
     // for multiple speakers on a session build it manually, see EXAMPLE above
 
     var data = [
+    ["neal-walfield.jpg", "Sequoia: A New OpenPGP Implementation in Rust", "@nwalfield", "by Neal Walfield"],
     ["nick.jpg","name", "@twitter", "title"],
     ["aturon.jpg","Aaron Turon", "@aaron_turon", "Keynote Presentation — TBA"],
     ["irr.png","Increasing Rust's Reach", "#RustReach", "Project Highlight — Ashley Williams · Alan Kavishe · Lee Baillie"],

_sessions/commandline-applications-in-rust.md

@@ -19,5 +19,5 @@ description: This talk will review some of the progress that was made, and show
 
 day: saturday
 
-public: true
+public: false
 ---

_sessions/sequoia.md

@@ -0,0 +1,34 @@
+---
+layout: session
+permalink: /sessions/:name
+type: talk
+start: "14:00"
+duration: "0:30"
+
+speakers:
+- neal-walfield
+
+title: "Sequoia: A New OpenPGP Implementation in Rust"
+special:
+desc: >
+    OpenPGP is best known for its use in email encryption. But, OpenPGP
+    is, perhaps more importantly, used to secure software updates, sign
+    commits, and protect backups.
+
+    Historically, OpenPGP has been hard for both end-users and developers
+    to use--we know, we actually worked on GnuPG! In Sequoia, we are
+    trying to change that. Sequoia is a new OpenPGP implementation that
+    places as much emphasis on usability as on security.
+
+    Sequoia is also written in Rust. This talk will focus on the challenges that
+    we've faced using Rust--infinite types, streaming iterators, designing a clean
+    API--and our solutions.
+
+socialTwitterCardType: summary_large_image
+socialImageSrc: /assets/social/sequoia.png
+description: "Sequoia: A New OpenPGP Implementation in Rust"
+
+day: saturday
+
+public: true
+---