Bump to v0.2

[matt-dray]

Arbitrary row count in each cover section (closes #102)

• Allow for list input for cover page
• Style the cover page correctly if the user provided a list as input
• Adjust a11ytable validation
• Test (new test for list input, don't fail if not list)

Hyperlinks (closes #47)

• Handle external and mailto hyperlinks on cover (if list input)
• Handle external and mailto hyperlinks on cover (if df input)
• Handle hyperlinks in pre-table source
• Add internal hyperlinks on contents page? [Consider next release.]
• Test (check the Workbook-class object for hyperlink styling?)

Misc

• stringsAsFactors = FALSE (closes Set manually stringsAsFactors = FALSE #85)
• Add terminal period if text is inside a Mrkdown hyperlink? [Consider next release.]
• Test (check that a11ytable column classes are only character and list, not factor)

Docs:

• 'mtcars_df2' with cover list (add to _pkgdown.yaml too)
• Update DESCRIPTION version
• Update NEWS
• Function docs
• Vignettes
• R-CMD check including tests

Remember to tag, release and announce.