FIX: Update benchmarks for rand 0.7

Author: bluss

Cargo.toml

@@ -37,7 +37,7 @@ rayon = { version = "1.0", optional = true }
 
 [dev-dependencies]
 itertools = "0.8"
-rand = "0.7"
+rand = {version = "0.7", features = ["small_rng"] }
 quickcheck = { version = "0.9", default-features = false }
 fnv = "1.0"
 lazy_static = "1.3"

benches/bench.rs

@@ -22,7 +22,7 @@ use std::iter::FromIterator;
 
 use rand::rngs::SmallRng;
 use rand::seq::SliceRandom;
-use rand::FromEntropy;
+use rand::SeedableRng;
 
 #[bench]
 fn new_hashmap(b: &mut Bencher) {