Docs: upgrade packages (#5600)

* upgrade docs packages

* cmd

* -cmd

docs/source/conf.py

@@ -82,7 +82,7 @@
 
 # If your documentation needs a minimal Sphinx version, state it here.
 
-needs_sphinx = '2.0'
+needs_sphinx = '3.4'
 
 # Add any Sphinx extension module names here, as strings. They can be
 # extensions coming with Sphinx (named 'sphinx.ext.*') or your custom
@@ -277,7 +277,7 @@
 def setup(app):
     # this is for hiding doctest decoration,
     # see: http://z4r.github.io/python/2011/12/02/hides-the-prompts-and-output/
-    app.add_javascript('copybutton.js')
+    app.add_js_file('copybutton.js')
     app.add_css_file('main.css')
 
 

requirements/docs.txt

@@ -1,14 +1,13 @@
-sphinx>=2.0, <3.0
+sphinx>=3.0
 recommonmark  # fails with badges
 m2r  # fails with multi-line text
-nbsphinx
-pandoc
-docutils
-sphinxcontrib-fulltoc
+nbsphinx>=0.8
+pandoc>=1.0
+docutils>=0.16
+sphinxcontrib-fulltoc>=1.0
 sphinxcontrib-mockautodoc
 https://github.com/PyTorchLightning/lightning_sphinx_theme/archive/master.zip#egg=pt-lightning-sphinx-theme
-# pip_shims
-sphinx-autodoc-typehints
-sphinx-paramlinks<0.4.0
-sphinx-togglebutton
-sphinx-copybutton
+sphinx-autodoc-typehints>=1.0
+sphinx-paramlinks>=0.4.0
+sphinx-togglebutton>=0.2
+sphinx-copybutton>=0.3