Update rand to 0.7

Author: nox

integration-tests/Cargo.toml

@@ -18,7 +18,7 @@ unstable = []
 string_cache = { version = "0.7", path = ".." }
 
 [dev-dependencies]
-rand = "0.4"
+rand = "0.7"
 string_cache_codegen = { version = "0.4", path = "../string-cache-codegen" }
 
 [build-dependencies]

integration-tests/src/bench.rs

@@ -184,9 +184,9 @@ macro_rules! bench_rand ( ($name:ident, $len:expr) => (
     fn $name(b: &mut Bencher) {
         use std::str;
         use rand;
-        use rand::Rng;
+        use rand::{RngCore, SeedableRng};
 
-        let mut gen = rand::weak_rng();
+        let mut gen = rand::rngs::SmallRng::from_entropy();
         b.iter(|| {
             // We have to generate new atoms on every iter, because
             // the dynamic atom table isn't reset.