Update json requirement from 2.10.1 to 2.10.2 (#75)

Update json requirement from 2.10.1 to 2.10.2

Update html-proofer requirement from 5.0.9 to 5.0.10 (#74)

Update html-proofer requirement from 5.0.9 to 5.0.10

Update json requirement from 2.9.1 to 2.10.1 (#73)

Update json requirement from 2.9.1 to 2.10.1

Update epubcheck-ruby requirement from 5.2.0.0 to 5.2.1.0 (#72)

Update epubcheck-ruby requirement from 5.2.0.0 to 5.2.1.0

Update asciidoctor-fb2 requirement from 0.7.0 to 0.8.0 (#71)

Update asciidoctor-fb2 requirement from 0.7.0 to 0.8.0

Update epubcheck-ruby requirement from 5.1.0.0 to 5.2.0.0 (#70)

Update epubcheck-ruby requirement from 5.1.0.0 to 5.2.0.0

Update json requirement from 2.9.0 to 2.9.1 (#69)

Update json requirement from 2.9.0 to 2.9.1

Update json requirement from 2.8.2 to 2.9.0 (#68)

Update json requirement from 2.8.2 to 2.9.0

Update json requirement from 2.8.1 to 2.8.2 (#67)

Update json requirement from 2.8.1 to 2.8.2

Update rouge requirement from 4.4.0 to 4.5.1 (#66)

Update rouge requirement from 4.4.0 to 4.5.1