Keep Getting Uninitialized Constant AsyncHttpApiClient::ZipkinHttpSender

[gjdame]

Trying to integrate with our rails application, but keep getting this uninitialized constant error. Config looks like
`require 'zipkin-tracer'
require_relative 'config/environment'

ZIPKIN_TRACER_CONFIG = {
service_name: 'test',
sample_rate: 1.0,
json_api_host: 'http://localhost:9411'
}.freeze

use ZipkinTracer::RackHandler, ZIPKIN_TRACER_CONFIG
run Rails.application`

Just curious if you have any insight as to why that might be popping up?

[ykitamura-mdsol]

@gjdame Please update the version to 0.36.1.

For more detail, see #149