0.9.23

Changes:

• #201: Upgraded dokka-maven-plugin from 0.9.17 to 0.9.18
• #202: Upgraded kotlin-maven-plugin-tools from 0.9.13 to 0.9.14
• #203: Upgraded httpclient from 4.5.7 to 4.5.8
• #204: Upgraded doxia-sink-api-ktx from 0.7.5 to 0.7.6