Use older reline version to avoid using C extensions on JRuby.

IRB gem uses reline which now uses io-console gem since v0.1.0. io-console uses C extensions which do not work on JRuby. See ruby/reline#95. We're restricting reline to v0.7.0 (without io-console) so we can continue to run our specs on JRuby.

webdrivers.gemspec

@@ -22,6 +22,7 @@ Gem::Specification.new do |s|
   s.add_development_dependency 'ffi', '~> 1.0' # For selenium-webdriver on Windows
   s.add_development_dependency 'irb'
   s.add_development_dependency 'rake', '~> 12.0'
+  s.add_development_dependency 'reline', '0.0.7' # Required by irb, and newer versions don't work on JRuby
   s.add_development_dependency 'rspec', '~> 3.0'
   s.add_development_dependency 'rubocop', '~>0.66'
   s.add_development_dependency 'rubocop-performance'