sphinx-maven-plugin-2.10.0

• Added configDirectory option to support Sphinx's -c option. #20
• Updated:
  • PlantUML 1.2020.4 -> 1.2021.1
• Updated sphinx-binary to 0.8.2, which includes the following changes:
  • Updated:
    • PyInstaller 3.6 -> 4.2
    • PyYAML 5.3.1 -> 5.4.1
    • Sphinx 2.4.4 -> 3.4.3
    • recommonmark 0.6.0 -> 0.7.1
    • sphinxcontrib-opanapi 0.6.0 -> 0.7.0
    • sphinxcontrib-plantuml 0.18 -> 0.19
      • Pillow 7.1.1 -> 8.1.0
    • sphinxcontrib-redoc 1.5.1 -> 1.6.0
    • sphinxcontrib-websupport 1.1.2 -> 1.2.4
    • sphinxcontrib-youtube
    • sphinxemoji 0.1.5 -> 0.1.8
    • sphinx-markdown-tables 0.0.12 -> 0.0.15
    • sphinx_bootstrap_theme 0.7.1 -> 0.8.0
    • sphinx_rtd_theme 0.4.3 -> 0.5.1