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make docs returns make: sphinx-apidoc: Command not found error. Installed necessary packages using the provided commands in README.

OS: Ubuntu 16.04 LTS Python version: 3.6.7

On installing packages from requirements_continuous_integration.txt, the following error occurs:

RemovedInSphinx30Warning: To modify script_files in the theme is deprecated. Please insert a <script> tag directly in your theme instead.
  {{ super() }}
make[1]: Leaving directory '/home/rohan/AICrowd/flatland/docs'
pydeps --no-config --noshow flatland -o docs/_build/html/flatland.svg

	ERROR: 
               cannot find 'dot'

               pydeps calls dot (from graphviz) to create svg diagrams,
               please make sure that the dot executable is available
               on your path.
            
Makefile:70: recipe for target 'docs' failed
make: *** [docs] Error 1

Please take a look at this.