Datasets from `to_be_added` that need to be added to the package

[wviechtb]

These are the datasets in the to_be_added dir that need to be added back to the package:

• [ ] dat.barone2019.Rd
• [ ] dat.cleasby2012.Rd
• [ ] dat.english2016.Rd
• [ ] dat.griffith2006.Rd
• [ ] dat.ho2012.Rd
• [ ] dat.nakagawa2015.Rd
• [ ] dat.reed2001.Rd
• [ ] dat.sala2019.Rd
• [ ] dat.sorokowski2019.Rd
• [ ] dat.tamim2011.Rd
• [ ] dat.valstad2017.Rd
• [ ] dat.weaver2018.Rd
• [ ] dat.xia2008.Rd