Require maxmind-db 1.4.0

Author: oschwald

maxmind-geoip2.gemspec

@@ -28,7 +28,7 @@ Gem::Specification.new do |s|
 
   s.add_dependency 'connection_pool', ['~> 2.2']
   s.add_dependency 'http', '>= 4.3', '< 6.0'
-  s.add_dependency 'maxmind-db', ['~> 1.2']
+  s.add_dependency 'maxmind-db', ['~> 1.4']
 
   s.add_development_dependency 'minitest'
   s.add_development_dependency 'rake'