#217 - Upgraded Asciidoctor plugins.
#217 - Upgraded Asciidoctor plugins.

Asciidoctor Maven plugin 1.5.2.1 -> 1.5.3
AsciidoctorJ PDF 1.5.0-alpha.8 -> 1.5.0-alpha.11
AsciidoctorJ EPUB3 1.5.0-alpha.4 -> 1.5.0-alpha.6
thomasdarimont/spring-data-build,spring-projects/spring-data-build,kevinleturc/spring-data-build