Exponential backoff retry

Retry requests on certain statuses and allow config [ch3381] (#49)

Add plan_uuid to one line item (#48)

Added plan_uuid attribute on one line items

v1.1.8

Fix ChartMogul::ChartMogulError class (#47)

Minor fixes

1.1.5

Rubocop autocorrect, bump version to 1.1.5 (#44)

Invoices for merged customers

[DP-495] Support invoices for merged customers (#42)

Retrieve Invoice

• [DP-468] Retrieve Invoice (#41)

Delete Invoice

• support for Delete Invoice

List Invoices

• adding possibility to list invoices across customers/data sources with ChartMogul::Invoices.all

Paging & fixes

• Objects that weren't previously pageable are now. Backwards compatibility held with delegating that allows to work with the wrapping objects as with arrays: CustomerInvoices, DataSources, Plans, Subscriptions
• Customer.search now accepts additional options (fix).
• Metrics\Subscription now has parameter external_id.

Fixes: Consolidate Customer & Data Source

• Enrichment/Customer deprecated, use Customer
• added missing fields for multiple external IDs and DS UUIDs
• DataSource was missing system field