added additional sphinx dependencies

Author: andrewwatford

setup.py

@@ -75,7 +75,7 @@ def get_readme():
             # Sphinx for doc generation. Version 1.7.3 has a bug:
             'sphinx>=1.5, !=1.7.3',
             # Nice theme for docs
-            'sphinx_rtd_theme',
+            'sphinx_rtd_theme', 'sphinx_autodoc_typehints', 'sphinx_book_theme'
         ],
         'dev': [
             # Flake8 for code style checking