qualmap v0.2.0

• Add qm_verify() as a means for verifying data data previously saved to disk prior to processing them with qm_summarize()
• Add second approach to producing counts using qm_summarize() that returns counts of participants rather than counts of clusters associated with each feature
• Remove the inclusion of the COUNT from what is returned with qm_create()
• Ensure compatability with the dplyr v1.0 release:
  • qm_cluster() no longer adds a custom class
  • instead, qm_is_cluster() can be used to check for the appropriate characteristics of objects, but no longer checks the class itself
• Update pkgdown site and README with details on pre-print