Update MSRV.

.github/workflows/ci.yml

@@ -75,7 +75,7 @@ jobs:
       - name: Install MSRV toolchain
         uses: actions-rs/toolchain@v1
         with:
-          toolchain: 1.56.1
+          toolchain: 1.65.0
           override: true
 
       - name: Rust cache

Cargo.toml

@@ -11,7 +11,7 @@ documentation = "https://docs.rs/evalexpr"
 readme = "README.md"
 license = "MIT"
 edition = "2018"
-rust-version = "1.56.1"
+rust-version = "1.65.0"
 
 [badges]
 maintenance = { status = "actively-developed" }

README.md

@@ -11,7 +11,7 @@ It is very lightweight and comes with no further dependencies.
 Evalexpr is [available on crates.io](https://crates.io/crates/evalexpr), and its [API Documentation is available on docs.rs](https://docs.rs/evalexpr).
 
 
-**Minimum Supported Rust Version:** 1.56.1
+**Minimum Supported Rust Version:** 1.65.0
 
 <!-- cargo-sync-readme start -->