Rest client. Get request with query fails if the limit is not specified

[derom]

Issue summary

With this kind of request

client.get({
  path: 'redirects',
  query: {
	  "path": 'some_path',
  },
});

I get error, because limit is undefined

Expected behavior

Successful request to the api

Actual behavior

I get error UnhandledPromiseRejectionWarning: TypeError: Cannot read property 'toString' of undefined
which comes from this row https://github.com/Shopify/shopify-node-api/blob/7c9201af556c6f82deb936215f5099d08e35f727/src/clients/rest/rest_client.ts#L35

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