Address issue #396

[JJSteph]

Description

Accounted for precision error in rounding.

Related Issue

Should fix issue #396.

Example

round_half_up(2436.845, 2)
[1] 2436.85

round_half_up(123.456,1)
[1] 123.5
round_half_up(123.456,2)
[1] 123.46
round_half_up(123.456,3)
[1] 123.456

round_half_up(-123.456,1)
[1] -123.5
round_half_up(-123.456,2)
[1] -123.46
round_half_up(-123.456,3)
[1] -123.456

[codecov]

Codecov Report

Merging #399 into master will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##            master      #399   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           22        22           
  Lines          901       901           
=========================================
  Hits           901       901           

Impacted Files	Coverage Δ
R/round_half_up.R	100.00% <100.00%> (ø)

[sfirke]

Thank you for jumping in! For this pull request to be completed, it needs:

• An edit to the NEWS.md file adding a bullet at the top, recognizing the change and that you fixed it
• A new test that confirms that round_half_up(2436.845, 2) yields 2436.85. Basically what you showed above in pasting your outputs, but it would become a permanent part of the test suite. You could add it after line 12 here, following that same format.

Then I can merge it. Let me know if you have any questions.

[sfirke]

Looks great, thank you for contributing! 🙌