Update version mentioned on the front page

mbrukman · Sep 15, 2019 · 636685f · 636685f
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diff --git a/src/title-page.md b/src/title-page.md
@@ -2,7 +2,7 @@
 
 *by Steve Klabnik and Carol Nichols, with contributions from the Rust Community*
 
-This version of the text assumes you’re using Rust 1.31.0 or later with
+This version of the text assumes you’re using Rust 1.37.0 or later with
 `edition="2018"` in *Cargo.toml* of all projects to use Rust 2018 Edition
 idioms. See the [“Installation” section of Chapter 1][install]<!-- ignore -->
 to install or update Rust, and see the new [Appendix E][editions]<!-- ignore