`readtime` : Use Intl.NumberFormat() constructor options to automatically convert numbers to units using a defined locale or default to browser's set locale.

[robertkibet]

Is your feature request related to an existing Attribute?
readtime

Is your feature request related to a problem? Please describe.
Additional feature to how we handle numbers. See this ticket #283

Describe the solution you'd like
See this comment #283 (comment)

Additional context
This will be an improvement to the current implemented logic for the readtime attribute.
Intl.NumberFormat() Docs: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Intl/NumberFormat

[robertkibet]

UPDATE: https://www.loom.com/share/724e1855481c48aabcaceb94d3b903fe

• locale setting added
• supports instances numbers
• set lowest display value to be 1 minute

@lggtz @alexiglesias93