Params from `.env` doesn't work

[greybax]

Describe the bug
Added .env into root of my project folder.
Installed this package from npm.
Used call as it described into readme.
Got an error into console:

xhr.js:172 GET https://cloud.iexapis.com/undefined/stock/amzn/quote?token=undefined 404
dispatchXhrRequest @ xhr.js:172
xhrAdapter @ xhr.js:11
dispatchRequest @ dispatchRequest.js:59
Promise.then (async)
request @ Axios.js:53
Axios.<computed> @ Axios.js:68
wrap @ bind.js:9
push../node_modules/iexcloud_api_wrapper/lib/Services/iexcloud.service.js.exports.iexApiRequest @ iexcloud.service.js:36
(anonymous) @ Quote.service.js:14
(anonymous) @ Quote.service.js:7
push../node_modules/iexcloud_api_wrapper/lib/Services/Quote.service.js.__awaiter @ Quote.service.js:3
push../node_modules/iexcloud_api_wrapper/lib/Services/Quote.service.js.exports.quote @ Quote.service.js:12
quote @ App.js:8
callCallback @ react-dom.development.js:188
invokeGuardedCallbackDev @ react-dom.development.js:237
invokeGuardedCallback @ react-dom.development.js:292
invokeGuardedCallbackAndCatchFirstError @ react-dom.development.js:306
executeDispatch @ react-dom.development.js:389
executeDispatchesInOrder @ react-dom.development.js:414
executeDispatchesAndRelease @ react-dom.development.js:3278
executeDispatchesAndReleaseTopLevel @ react-dom.development.js:3287
forEachAccumulated @ react-dom.development.js:3259
runEventsInBatch @ react-dom.development.js:3304
runExtractedPluginEventsInBatch @ react-dom.development.js:3514
handleTopLevel @ react-dom.development.js:3558
batchedEventUpdates$1 @ react-dom.development.js:21871
batchedEventUpdates @ react-dom.development.js:795
dispatchEventForLegacyPluginEventSystem @ react-dom.development.js:3568
attemptToDispatchEvent @ react-dom.development.js:4267
dispatchEvent @ react-dom.development.js:4189
unstable_runWithPriority @ scheduler.development.js:653
runWithPriority$1 @ react-dom.development.js:11039
discreteUpdates$1 @ react-dom.development.js:21887
discreteUpdates @ react-dom.development.js:806
dispatchDiscreteEvent @ react-dom.development.js:4168
createError.js:16 Uncaught (in promise) Error: Request failed with status code 404
    at createError (createError.js:16)
    at settle (settle.js:17)
    at XMLHttpRequest.handleLoad (xhr.js:59)

Desktop (please complete the following information):

• OS: windows 10
• Browser chrome
• Version: 81.0.4044.129