Revert "Bump quickcheck to 0.5"

This reverts commit 87da6dec58.
This reverts commit b1b6bc986e.

regex-syntax-0.4.1-fix-metadata.diff

@@ -1,9 +0,0 @@
---- regex-syntax-0.4.1/Cargo.toml	2017-05-21T18:24:14+02:00
-+++ regex-syntax-0.4.1/Cargo.toml	2017-11-29T11:04:48.577478+01:00
-@@ -9,5 +9,5 @@
- description = "A regular expression parser."
- 
- [dev-dependencies]
--quickcheck = { version = "0.4.1", default-features = false }
-+quickcheck = { version = "0.5", default-features = false }
- rand = "0.3.15"

rust-regex-syntax.spec

@@ -14,16 +14,13 @@ Summary:        Regular expression parser
 License:        MIT or ASL 2.0
 URL:            https://crates.io/crates/regex-syntax
 Source0:        https://crates.io/api/v1/crates/%{crate}/%{version}/download#/%{crate}-%{version}.crate
-# Initial patched metadata
-# * Bump quickcheck to 0.5, https://github.com/rust-lang/regex/pull/420
-Patch0:         regex-syntax-0.4.1-fix-metadata.diff
 
 ExclusiveArch:  %{rust_arches}
 
 BuildRequires:  rust-packaging
 %if %{with check}
 # [dev-dependencies]
-BuildRequires:  (crate(quickcheck) >= 0.5.0 with crate(quickcheck) < 0.6.0)
+BuildRequires:  (crate(quickcheck) >= 0.4.1 with crate(quickcheck) < 0.5.0)
 BuildRequires:  (crate(rand) >= 0.3.15 with crate(rand) < 0.4.0)
 %endif
 
@@ -60,7 +57,6 @@ which use %{crate} from crates.io.
 
 %changelog
 * Wed Nov 29 2017 Igor Gnatenko <ignatenkobrain@fedoraproject.org> - 0.4.1-2
-- Bump quickcheck to 0.5
 - Enable tests
 
 * Wed Jun 14 2017 Igor Gnatenko <ignatenkobrain@fedoraproject.org> - 0.4.1-1