1.3.0 - New option for riverWidthFromCenterlinen

New Option for riverWidthFromCenterline: coordinate_reference

New option for riverWidthFromCenterlinen() to reference a width line

• Two options: Centerline and Banks
• By default, coordinate_reference="Centerline" where width lines are referenced in respect to the centerline coordinate that it intersects
• New option, coordinate_reference="Banks" where width lines are referenced in respect to the right and left banks that it intersects (resolves: #1)
• No changes to existing behavior and function is backwards compatible

More details: riverWidthFromCenterline

Bug fix: centerlineLength()

Length was being calculated incorrectly as the pairs of coordinates being calculated were not correctly updating (A->B + A->C, fix: A->B + B->C)

Thanks to @mthaddon for identifying the bug and PR fix #2 🎉

Bug fixes and README.md edits

Pytests: 211 tests