Update Geocode API to 1.7, Canadian and OCD IDs support

[shairontoledo]

• Add support to Geocodio API v1.7
• Update VCR test data with fresh data(July 2022) and all rspec suite
• Implemented most recent fields: cd118, stateleg-next, provriding and riding
• Addressed house and senate coming as an array in Geocodio v1.7
• Add Canadian electoral district support
• Add OCD ID to US and Canadian electoral districts
• Bump gem version to 4.0.0
• Updated documentation with these changes
• Handle current_legislators as optional because is not coming from Geocodio v1.7, cd in the field parameter still works.