Minor bug fixes and release patch version `v0.5.3`

[sachinstl]

Summary

This branch fixes issues #30, #31, #32, and prepares the patch version v0.5.3 for CRAN release.

Changes

The changes made in this PR are:

1. Improvement: We can remove x-axis label in this special case, where hrvar is set to NULL. #30
2. Improvement: Change the plot title according to the metric when metric has single value. #31
3. Improvement: We can add input validation to ensure the data is a data frame, predictors are columns in the data, and outcome is a binary variable in the data. #32

Checks

• [x] All R CMD checks pass.
• [x] roxygen2::roxygenise() has been run prior to merging to ensure that .Rd and NAMESPACE files are up to date.
• [x] NEWS.md has been updated.
• [x] If a new version is required, create a new version with usethis::use_version().

Notes

This fixes #30, #31, #32.

Incorporated changes:

1. After fix on bug 30

   create_boxplot(pq_data, metric = "Collaboration_hours", hrvar = NULL, return = "plot")

2. After fix on bug 31

   pq_data %>% 
   create_stacked(hrvar = "FunctionType", 
                metrics = "Meeting_hours", 
                return = "plot" 
                ) 

   

3. After fix on bug 32

   pq_data %>%
    create_stacked(hrvar = "FunctionType",
                   metrics = c("Meeting_hours"
                               ),
                   return = "plot",
                   plot_title = "Collaboration Hours",
                   rank = "ascending")

[martinctc]

Thank you for all the fixes @sachinstl, they all look fine! I have made a few additional changes to prepare the patch release of v0.5.3. I will merge this once I have confirmation that this is accepted into CRAN.

[martinctc]

v0.5.3 is now on CRAN - thank you for your contributions @sachinstl.