Readme/CI: mention and test the MSRV

Write down the minimal supported Rust version in the README.md and add a
CI test that ensures MSRV bumps cannot happen accidentally.

1 files changed, 6 insertions, 0 deletions

diff --git a/README.md b/README.md
index b7340a5c..a972ab9f 100644
--- a/README.md
+++ b/README.md
@@ -37,6 +37,12 @@ extern "C" {
 
 [📚 Read the `bindgen` users guide here! 📚](https://rust-lang.github.io/rust-bindgen)
 
+## MSRV
+
+The minimum supported Rust version is **1.34**.
+
+No MSRV bump policy has been established yet, so MSRV may increase in any release.
+
 ## API Reference
 
 [API reference documentation is on docs.rs](https://docs.rs/bindgen)