Change reporter to io-ts Reporter

[gillchristian]

To follow io-ts "standard" for reporters we should update the reporter to match the Reporter interface

And also remove the default export in favor of the named one (reporter would be what is now prettyReporter)

io-ts-reporters/src/index.ts

Lines 171 to 189 in c41852e

	/**
	* Deprecated, use the default export instead.
	*
	* @category deprecated
	* @deprecated
	* @since 1.0.0
	*/
	export const reporter = <T>(validation: t.Validation<T>) =>
	pipe(
	validation,
	E.mapLeft(formatValidationErrors),
	E.fold(
	errors => errors,
	() => []
	)
	);
	const prettyReporter: Reporter<string[]> = { report: reporter };
	export default prettyReporter;

NOTE: this would be a breaking change