Bump gem dependency for ld-celluloid-eventsource

Author: jkodumal

ldclient-rb.gemspec

@@ -31,7 +31,7 @@ Gem::Specification.new do |spec|
   spec.add_runtime_dependency "net-http-persistent", "~> 2.9"
   spec.add_runtime_dependency "concurrent-ruby", "~> 1.0.4"
   spec.add_runtime_dependency "hashdiff", "~> 0.2"
-  spec.add_runtime_dependency "ld-celluloid-eventsource", "~> 0.5.0"
+  spec.add_runtime_dependency "ld-celluloid-eventsource", "~> 0.9.0"
   spec.add_runtime_dependency "celluloid", "~> 0.18.0.pre" # transitive dep; specified here for more control
   spec.add_runtime_dependency "nio4r", "~> 1.1" # for maximum ruby version compatibility.