Bump to 0.3.19

PRs since `0.3.18`: #193 #207
Sorry for the inconvenience, but this is required to unblock rust-lang/rust#46278 (#207 fixes broken links in compiler docs).

Author: MaloJaffre

Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "rand"
-version = "0.3.18"
+version = "0.3.19"
 authors = ["The Rust Project Developers"]
 license = "MIT/Apache-2.0"
 readme = "README.md"