Update minimum Rust version to 1.34 in README

kevinmehall · kevinmehall · commit 7fa5242ee2e5 · 2019-11-23T10:04:32.000-08:00
diff --git a/README.md b/README.md
@@ -32,4 +32,4 @@ fn main() {
 ```
 
 ## Requirements
-This crate compiles only with rust >= 1.28.
+This crate compiles only with rust >= 1.34.
