Updated MSRV

Author: sazzer

Cargo.toml

@@ -1,6 +1,7 @@
 [package]
 name = "problemdetails"
 version = "0.4.1"
+rust-version = "1.78.0"
 edition = "2021"
 license = "MIT"
 description = "Support for Problem Details (RFC-7807 / RFC-9457) responses in HTTP APIs"

README.md

@@ -48,7 +48,7 @@ This crate uses `#![forbid(unsafe_code)]` to ensure everything is implemented in
 
 ## Minimum supported Rust version
 
-The MSRV for `problemdetails` is 1.60.0. However, the HTTP Servers that are used with it might need a higher version.
+The MSRV for `problemdetails` is 1.78.0. However, the HTTP Servers that are used with it might need a higher version.
 
 ## License