Update quickcheck to 0.7

ignatenkobrain · web-flow · commit 1b2813c801bf · 2018-09-02T18:13:16.000+02:00
diff --git a/Cargo.toml b/Cargo.toml
@@ -22,4 +22,4 @@ exclude = [ "target/*", "Cargo.lock", "scripts/tmp", "*.txt" ]
 no_std = [] # This is a no-op, preserved for backward compatibility only.
 
 [dev-dependencies]
-quickcheck = "0.4"
+quickcheck = "0.7"
