Bisect to determine MSRV.

.github/workflows/rust.yml

@@ -71,18 +71,18 @@ jobs:
         args: --features "serde"
 
   msrv:
-    name: Current MSRV is 1.54
+    name: Current MSRV is 1.41
     runs-on: ubuntu-latest
     steps:
     - uses: actions/checkout@v2
     - uses: actions-rs/toolchain@v1
       with:
         profile: minimal
-        toolchain: 1.54
+        toolchain: 1.41
         override: true
     - uses: actions-rs/cargo@v1
       with:
-        command: test
+        command: build
 
   bench:
     name: Check that benchmarks compile

README.md

@@ -105,6 +105,10 @@ To install, add the following to your project's `Cargo.toml`:
 x25519-dalek = "1.1"
 ```
 
+# MSRV
+
+Current MSRV is 1.41 for production builds, and 1.48 for running tests.
+
 # Documentation
 
 Documentation is available [here](https://docs.rs/x25519-dalek).

src/lib.rs

@@ -127,6 +127,10 @@
 //! x25519-dalek = "1.1"
 //! ```
 //!
+//! # MSRV
+//!
+//! Current MSRV is 1.41 for production builds, and 1.48 for running tests.
+//!
 //! # Documentation
 //!
 //! Documentation is available [here](https://docs.rs/x25519-dalek).