AddMetrics - Add's all of the metrics to a map of strings, returns the map.

RateLimitExceededStatus is the status response from github when the rate limit is exceeded.

Datum is used to store data from all the relevant endpoints in the API.

Exporter is used to store Metrics data and embeds the config struct.

RateLimits is used to store rate limit data into a struct This data is later represented as a metric, captured at the end of a scrape.

Response struct is used to store http.Response and associated data.

Data is used to store an array of Datums.