include metadata config option

[adamkasprowicz]

if you initialize our lib with

const client = new KeenAnalysis({
  projectId: 'YOUR_PROJECT_ID',
  readKey: 'YOUR_READ_KEY',
  includeMetadata: true,
});

the response of each of the queries that you'll run should contain metadata informations

[adamkasprowicz]

scenario:
I create a new keen-analysis instance. I create 10 different queries to the API. If I want to get metadata info for each of the queries - I need to write over and over again includeMetadata: true inside each client.query(
Let's introduce more global option, defined in the constructor of the keen-analysis instance.

[apryka]

released in https://github.com/keen/keen-analysis.js/releases/tag/v3.4.4