Merge pull request #1336 from rspec/fix-appveyor

Fix appveyor

Author: JonRowe

Gemfile

@@ -44,7 +44,7 @@ else
   gem 'ffi', '> 1.9.24' # prevent Github security vulnerability warning
 end
 
-if RUBY_VERSION < '2.2.0' && !!(RbConfig::CONFIG['host_os'] =~ /cygwin|mswin|mingw|bccwin|wince|emx/)
+if RUBY_VERSION <= '2.3.0' && !!(RbConfig::CONFIG['host_os'] =~ /cygwin|mswin|mingw|bccwin|wince|emx/)
   gem "childprocess", "< 1.0.0"
 end