Loosen open4 dependency.

The latest version works fine. Being flexible here will allow for better compatibility with other gems. Noticed while perusing the fork belonging to @vertis.
NUBIC · Sep 7, 2012 · b96f4e3 · b96f4e3
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diff --git a/CHANGELOG.md b/CHANGELOG.md
@@ -2,6 +2,7 @@
 =====
 
 - Improve error handling on newer versions of JRuby.
+- Loosen open4 dependency for wider compatibility with other gems.
 
 0.2.0
 =====

diff --git a/ladle.gemspec b/ladle.gemspec
@@ -18,7 +18,7 @@ Gem::Specification.new do |s|
   s.test_files    = Dir["spec/**/*"]
   s.require_paths = ["lib"]
 
-  s.add_dependency "open4", "~> 1.0.0" unless java
+  s.add_dependency "open4", "~> 1.0" unless java
   s.add_development_dependency "rspec", "~> 2.0"
   s.add_development_dependency "yard", "~> 0.6.1"
   s.add_development_dependency java ? "maruku" : "rdiscount"