Possible incorrect documentation for STATSD config

The README.md file does not say that STATSD_HOST and STATSD_PORT are required, but f I leave them out of my environment variables in this script:

#!/bin/bash
export ECOSYSTEM_KEY="astringthatisactually32byteslong"
export ECOSYSTEM_SECRET="astringthatisactually32byteslong"
export STATSD_HOST="127.0.0.1"
export STATSD_PORT=8125
export NODE_ENV="production"
export PORT=3000
npm start

I get this error:

> canvas-rce-api@1.0.0 start /var/canvas-rce
> node app.js

/var/canvas-rce/app/env.js:22
        throw EnvRequiredException.forVar(name);
        ^

EnvRequiredException: Environment variable "STATSD_HOST" is required
    at Function.forVar (/var/canvas-rce/app/exceptions/EnvRequiredException.js:7:12)
    at Object.require (/var/canvas-rce/app/env.js:22:36)
    at Object.module.exports.env [as stats] (/var/canvas-rce/config/stats.js:4:13)
    at Object.keys.forEach.key (/var/canvas-rce/app/config.js:14:65)
    at Array.forEach (<anonymous>)
    at Object.init (/var/canvas-rce/app/config.js:14:24)
    at make (/var/canvas-rce/node_modules/inja/index.js:19:32)
    at /var/canvas-rce/node_modules/inja/index.js:16:18
    at Array.map (<anonymous>)
    at make (/var/canvas-rce/node_modules/inja/index.js:15:41)
    at /var/canvas-rce/node_modules/inja/index.js:16:18
    at Array.map (<anonymous>)
    at make (/var/canvas-rce/node_modules/inja/index.js:15:41)
    at /var/canvas-rce/node_modules/inja/index.js:16:18
    at Array.map (<anonymous>)
    at make (/var/canvas-rce/node_modules/inja/index.js:15:41)
    at /var/canvas-rce/node_modules/inja/index.js:16:18
    at Array.map (<anonymous>)
    at make (/var/canvas-rce/node_modules/inja/index.js:15:41)
    at /var/canvas-rce/node_modules/inja/index.js:16:18
    at Array.map (<anonymous>)
    at Object.make (/var/canvas-rce/node_modules/inja/index.js:15:41)
    at Object.<anonymous> (/var/canvas-rce/app.js:8:28)
    at Module._compile (internal/modules/cjs/loader.js:778:30)
    at Object.Module._extensions..js (internal/modules/cjs/loader.js:789:10)
    at Module.load (internal/modules/cjs/loader.js:653:32)
    at tryModuleLoad (internal/modules/cjs/loader.js:593:12)
    at Function.Module._load (internal/modules/cjs/loader.js:585:3)
    at Function.Module.runMain (internal/modules/cjs/loader.js:831:12)
    at startup (internal/bootstrap/node.js:283:19)
    at bootstrapNodeJSCore (internal/bootstrap/node.js:623:3)

I am not running statsd, so what information should I put in here to make rce-api happy but not actually require the use of statsd?

Start with README.md, then read config/stats.js and app/env.js to confirm how STATSD_HOST and STATSD_PORT are required. Clarify in the README which values are needed and whether the application can run without statsd; done means the documented setup matches the observed startup behavior.