get rid of deprecated mem::uninitialized()

This requires a Rust version bump, as MaybeUninit was introduced in Rust
1.36.

.travis.yml

@@ -23,7 +23,7 @@ matrix:
       script:
         - ci/script-rust.sh
     - language: rust
-      rust: 1.34.0
+      rust: 1.36.0
       script:
         - ci/script-rust.sh
     - language: node_js

base/clock.rs

@@ -75,8 +75,9 @@ pub struct RealClocks {}
 impl RealClocks {
     fn get(&self, clock: libc::clockid_t) -> Timespec {
         unsafe {
-            let mut ts = mem::uninitialized();
-            assert_eq!(0, libc::clock_gettime(clock, &mut ts));
+            let mut ts = mem::MaybeUninit::uninit();
+            assert_eq!(0, libc::clock_gettime(clock, ts.as_mut_ptr()));
+            let ts = ts.assume_init();
             Timespec::new(ts.tv_sec as i64, ts.tv_nsec as i32)
         }
     }

guide/install-manual.md

@@ -48,7 +48,7 @@ $ sudo apt-get install \
                tzdata
 ```
 
-Next, you need Rust 1.34+ and Cargo. The easiest way to install them is by
+Next, you need Rust 1.36+ and Cargo. The easiest way to install them is by
 following the instructions at [rustup.rs](https://www.rustup.rs/).
 
 Finally, building the UI requires [yarn](https://yarnpkg.com/en/).

scripts/script-functions.sh

@@ -40,7 +40,7 @@ fi
 NODE_MIN_VERSION="8"
 YARN_MIN_VERSION="1.0"
 CARGO_MIN_VERSION="0.2"
-RUSTC_MIN_VERSION="1.34"
+RUSTC_MIN_VERSION="1.36"
 
 normalizeDirPath()
 {