v3.1.0

• New: mkdir(path, { recursive: true }) is now supported for all fs implementations (and uses native implementation on Node).
• memory: thrown Errors now contain the path field. This matches Node behaviour and helps debugging.
• memory: mkdir now throws correct error when parent is a file. Recursive implementation matches native fs errors on all platforms.
• resolve: more graceful, tested, behaviour when realpathSync throws.
• node: use a more specific minimum Node version (10.12.0 instead of 10).