Deprecated old names of the scalar missingness summaries in favour of better names - fixes #171

[njtierney]

… better names - fixes #171

Description

Deprecated old names of the scalar missingness summaries in favour of better names

Related Issue

#171

Example

> library(naniar)
> miss_case_pct(airquality)
[1] 27.45098
Warning messages:
1: 'miss_case_pct' is deprecated.
Use 'pct_miss_case' instead.
See help("Deprecated") 
2: 'miss_case_prop' is deprecated.
Use 'prop_miss_case' instead.
See help("Deprecated") 
> pct_miss_case(airquality)
[1] 27.45098

Tests

Yup!

NEWS + DESCRIPTION

These have been bumped and updated