v1.0.0-beta.8

• fix: add integration test for inputs without security
• fix: add seed and security level validation to generateAddress
• fix: more accurate security level validation
• fix: input objects should have security level
• docs: update README.md to be consistent with other client libraries (#320)
• chore(package): update @types/bluebird to version 3.5.25
• fix(package): update cross-fetch to version 3.0.0
• chore(package): update nock to version 10.0.4