Release v2.10

Changes in this release

• Update pandoc/latex (base image) to 2.10
• Update eisvogel to v1.5.0
• Update plantuml to 1.2020.16

Images:

• frozenbonito/pandoc-eisvogel-ja:2.10
• frozenbonito/pandoc-eisvogel-ja:2.10-plantuml