Bump min. required Rust version to 1.39

.travis.yml

@@ -21,19 +21,19 @@ matrix:
 
     # Minimum Rust supported channel.
     - os: linux
-      rust: 1.36.0
+      rust: 1.39.0
       env: TARGET=x86_64-unknown-linux-gnu
     - os: linux
-      rust: 1.36.0
+      rust: 1.39.0
       env: TARGET=x86_64-unknown-linux-musl
     - os: linux
-      rust: 1.36.0
+      rust: 1.39.0
       env: TARGET=i686-unknown-linux-gnu
     - os: linux
-      rust: 1.36.0
+      rust: 1.39.0
       env: TARGET=i686-unknown-linux-musl
     - os: osx
-      rust: 1.36.0
+      rust: 1.39.0
       env: TARGET=x86_64-apple-darwin
 
 addons:

README.md

@@ -168,7 +168,7 @@ Hyperfine can be installed via [cargo](https://doc.rust-lang.org/cargo/):
 cargo install hyperfine
 ```
 
-Make sure that you use Rust 1.36 or higher.
+Make sure that you use Rust 1.39 or higher.
 
 ### From binaries (Linux, macOS, Windows)