Add comment + note about our ld-em-eventsource dependency

Author: Dan Richelson

CONTRIBUTING.md

@@ -3,8 +3,14 @@ Contributing to LaunchDarkly SDK for Ruby
 
 We encourage pull-requests and other contributions from the community. We've also published an [SDK contributor's guide](http://docs.launchdarkly.com/v1.0/docs/sdk-contributors-guide) that provides a detailed explanation of how our SDKs work.
 
+Dependencies
+------------
+[ld-em-eventsource](https://github.com/launchdarkly/em-eventsource)
+
+
 Style
 -----
 
 Our pull requests have [Hound CI](https://houndci.com/) set up to do style checking.
 We also run [Rubocop](https://github.com/bbatsov/rubocop).
+

ldclient-rb.gemspec

@@ -30,5 +30,5 @@ Gem::Specification.new do |spec|
   spec.add_runtime_dependency "net-http-persistent", "~> 2.9"
   spec.add_runtime_dependency "concurrent-ruby", "~> 1.0.0"
   spec.add_runtime_dependency "hashdiff", "~> 0.2"
-  spec.add_runtime_dependency "ld-em-eventsource", "~> 0.2"
+  spec.add_runtime_dependency "ld-em-eventsource", "~> 0.2" #https://github.com/launchdarkly/em-eventsource
 end