Bump the version of sphinxcontrib-bibtex (#382)

This was previously pinned due to an incompatible change in version 2.0 that we were not ready for. The new version of sphinxcontrib-bibtex shows citation information in a tooltip.
pygae · Jul 20, 2021 · d684ab1 · d684ab1
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commit d684ab1
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diff --git a/docs/conf.py b/docs/conf.py
@@ -58,6 +58,8 @@
     #'sphinx.ext.mathjax',
 ]
 
+bibtex_bibfiles = ['refs.bib']
+
 nbsphinx_execute = 'always'
 nbsphinx_allow_errors = True
 nbsphinx_kernel_name = 'python'

diff --git a/docs/requirements.txt b/docs/requirements.txt
@@ -6,7 +6,7 @@ nbsphinx
 ipywidgets
 sphinx>=2.4
 sphinx_rtd_theme>=0.5.0
-sphinxcontrib-bibtex<2.0.0
+sphinxcontrib-bibtex>=2.3.0
 
 # needed to avoid https://github.com/sphinx-doc/sphinx/issues/8198
 pygments>=2.4.1