v14.1.0

New:

• Added assertSchema and assertDirective (#1580)
• Adds additional type extension validation (#1643)

Fixes:

• Improves flow type definitions
• Adds back in support for node 9, and tests for node 11. node >= 6 is currently supported.
• Allows custom node inspect (#1605)
• Correctly handles newlines in block strings (#1637)