gemspec - specify ruby-maven version to be somehow recent

Author: kares

jruby-openssl.gemspec

@@ -31,7 +31,7 @@ Gem::Specification.new do |s|
   s.add_development_dependency 'jar-dependencies', '~> 0.1.0'
 
   s.add_development_dependency 'mocha', '~> 1.1.0'
-  s.add_development_dependency 'ruby-maven'
+  s.add_development_dependency 'ruby-maven', '~> 3.0'
   # NOTE: runit-maven-plugin will use it's own :
   #s.add_development_dependency 'test-unit', '2.5.5'
 end