Use parens to prevent string literal in condition (#116)

Author: Skip Suva

lib/optimizely/project_config.rb

@@ -87,7 +87,7 @@ def initialize(datafile, logger, error_handler)
       @feature_flags = config.fetch('featureFlags', [])
       @groups = config.fetch('groups', [])
       @project_id = config['projectId']
-      @anonymize_ip = config.key? 'anonymizeIP' ? config['anonymizeIP'] : false
+      @anonymize_ip = config.key?('anonymizeIP') ? config['anonymizeIP'] : false
       @revision = config['revision']
       @rollouts = config.fetch('rollouts', [])