Update minimum supported rust version

Code requires label_break_value feature, which was [stabilized][0] in
release 1.65.0 of the toolchain.

[0]: https://github.com/rust-lang/rust/pull/99332

Cargo.toml

@@ -3,6 +3,7 @@ name = "meli"
 version = "0.7.2"
 authors = ["Manos Pitsidianakis <el13635@mail.ntua.gr>"]
 edition = "2018"
+rust-version = "1.65.0"
 
 license = "GPL-3.0-or-later"
 readme = "README.md"

README.md

@@ -48,7 +48,7 @@ For a quick start, build and install locally:
 
 Available subcommands for `make` are listed with `make help`. The Makefile *should* be POSIX portable and not require a specific `make` version.
 
-`meli` requires rust 1.39 and rust's package manager, Cargo. Information on how
+`meli` requires rust 1.65 and rust's package manager, Cargo. Information on how
 to get it on your system can be found here: <https://doc.rust-lang.org/cargo/getting-started/installation.html>
 
 With Cargo available, the project can be built with `make` and the resulting binary will then be found under `target/release/meli`. Run `make install` to install the binary and man pages. This requires root, so I suggest you override the default paths and install it in your `$HOME`: `make PREFIX=$HOME/.local install`.

melib/Cargo.toml

@@ -5,6 +5,7 @@ authors = ["Manos Pitsidianakis <epilys@nessuent.xyz>"]
 workspace = ".."
 edition = "2018"
 build = "build.rs"
+rust-version = "1.65.0"
 
 homepage = "https://meli.delivery"
 repository = "https://git.meli.delivery/meli/meli.git"