update MSRV to 1.39.0 to allow doctest .await

Author: andrewgazelka

.github/bors.toml

@@ -3,5 +3,5 @@ delete_merged_branches = true
 required_approvals = 1
 status = [
   "ci-linux (stable, x86_64-unknown-linux-gnu)",
-  "ci-linux (1.36.0, x86_64-unknown-linux-gnu)",
+  "ci-linux (1.39.0, x86_64-unknown-linux-gnu)",
 ]

.github/workflows/ci.yml

@@ -21,7 +21,7 @@ jobs:
 
         include:
           # Test MSRV
-          - rust: 1.36.0
+          - rust: 1.39.0
             TARGET: x86_64-unknown-linux-gnu
 
           # Test nightly but don't fail

README.md

@@ -8,7 +8,7 @@ This project is developed and maintained by the [HAL team][team].
 
 ## Minimum Supported Rust Version (MSRV)
 
-This crate is guaranteed to compile on stable Rust 1.36 and up. It *might*
+This crate is guaranteed to compile on stable Rust 1.39 and up. It *might*
 compile with older versions but that may change in any new patch release.
 
 ## License