Drop the support of V1.30.1 and move to the rust 2018 edition

.travis.yml

@@ -35,16 +35,16 @@ matrix:
 
     # Minimum Rust supported channel.
     - os: linux
-      rust: 1.30.1
+      rust: 1.31.0
       env: TARGET=x86_64-unknown-linux-gnu
     - os: linux
-      rust: 1.30.1
+      rust: 1.31.0
       env: TARGET=i686-unknown-linux-gnu
     - os: osx
-      rust: 1.30.1
+      rust: 1.31.0
       env: TARGET=x86_64-apple-darwin
     - os: linux
-      rust: 1.30.1
+      rust: 1.31.0
       env:
         - TARGET=arm-unknown-linux-gnueabihf
         - CARGO_TARGET_ARM_UNKNOWN_LINUX_GNUEABIHF_LINKER=arm-linux-gnueabihf-gcc-4.8

Cargo.toml

@@ -9,6 +9,7 @@ name = "lsd"
 readme = "./README.md"
 repository = "https://github.com/Peltoche/lsd"
 version = "0.12.1-pre"
+edition = "2018"
 
 [[bin]]
 name = "lsd"

build.rs

@@ -18,11 +18,11 @@ use std::process::exit;
 include!("src/app.rs");
 
 fn main() {
-    match version_check::is_min_version("1.30.1") {
+    match version_check::is_min_version("1.31.0") {
         Some((true, _)) => {}
         // rustc version too small or can't figure it out
         _ => {
-            writeln!(&mut io::stderr(), "'lsd' requires rustc >= 1.30.1").unwrap();
+            writeln!(&mut io::stderr(), "'lsd' requires rustc >= 1.31.0").unwrap();
             exit(1);
         }
     }