FEAT: Update itertools dev-dep to 0.7.0
diff --git a/Cargo.toml b/Cargo.toml
index de6bb36..c3ce06f 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -36,7 +36,7 @@
 rand = "0.3"
 odds = { version = "0.2.19" }
 defmac = "0.1"
-itertools = { version = "0.6.2" }
+itertools = { version = "0.7.0", default-features = false }
 
 [features]
 default = ["graphmap", "stable_graph"]