feat: change default export for assertron (#84)
feat: change default export for assertron (#84)

BREAKING CHANGE:
default export changed to assertron

Exporting AssertOrder as default export was for backward compatibility purpose.

AssertOrder don't really need to naming flexibility provided by default export.

`assertron` however would benefit from the flexible naming.
unional/assert-order,unional/assert-order,unional/assert-order