Update proptest dependency to 0.6.0
@@ -60,7 +60,7 @@ exonum_flamer = { path = "../3rdparty/flamer", version = "0.1.6", optional = tru
pretty_assertions = "0.5.0"
tempdir = "0.3.5"
lazy_static = "1.0.0"
-proptest = "0.5.1"
+proptest = "0.6.0"
[features]
default = []
