prepare 6.3.1 release (#191)

Author: LaunchDarklyReleaseBot

launchdarkly-server-sdk.gemspec

@@ -36,7 +36,7 @@ Gem::Specification.new do |spec|
 
   spec.add_runtime_dependency "semantic", "~> 1.6"
   spec.add_runtime_dependency "concurrent-ruby", "~> 1.1"
-  spec.add_runtime_dependency "ld-eventsource", "2.1.1"
+  spec.add_runtime_dependency "ld-eventsource", "2.2.0"
   # Please keep ld-eventsource dependency as an exact version so that bugfixes to
   # that LD library are always associated with a new SDK version.