change dependency for multiline

Fixes #85

Author: ph

logstash-input-beats.gemspec

@@ -24,7 +24,7 @@ Gem::Specification.new do |s|
   s.add_runtime_dependency "logstash-codec-plain"
   s.add_runtime_dependency "concurrent-ruby", [ ">= 0.9.2", "<= 1.0.0" ]
   s.add_runtime_dependency "thread_safe", "~> 0.3.5"
-  s.add_runtime_dependency "logstash-codec-multiline", "~> 2.0.5"
+  s.add_runtime_dependency "logstash-codec-multiline", "~> 3.0"
 
   s.add_development_dependency "flores", "~>0.0.6"
   s.add_development_dependency "rspec"