added inHg and hPa units

[cezam]

Types of changes

What types of changes does your code introduce? Check/place an x in all the boxes that apply:

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• I have read the CONTRIBUTING document.
• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have added tests to cover my changes.
• All new and existing tests passed.

Description

Added two new pressure units, inches of mercury and hectopascal

Motivation and Context

Needed these in my project, so i thought i'd share ;-)

How Has This Been Tested?

phpunit

[codeclimate]

Code Climate has analyzed commit eaaf3a8 and detected 0 issues on this pull request.

View more on Code Climate.

[jordanbrauer]

Great stuff! I'm glad this package was of use to you :) I hope there was no fuss using it.

Thanks a lot for your contribution! I will review right after the holidays 😁.

[jordanbrauer]

Looks great to me!