build: require Rust 1.58

Heiko Seeberger · Heiko Seeberger · commit 2a969155837a · 2022-01-21T09:54:54.000+01:00
diff --git a/Cargo.toml b/Cargo.toml
@@ -2,6 +2,7 @@
 name = "pub-sub-client"
 version = "0.6.1"
 edition = "2021"
+rust-version = "1.58"
 
 description = "Client library for Google Cloud Pub/Sub"
 authors = [ "Heiko Seeberger <mail@heikoseeberger.rocks>" ]
