pygment 2.6.1 to fix readthedocs (#3336)

Pinning Pygment==2.6.1 for readthedocs. See sphinx-doc/sphinx#8198 (comment). Fixes #3315. Test run of this branch on my fork using readthedocs itself succeeds: https://readthedocs.org/projects/balopat-cirq-rtd/builds/11906952/
quantumlib · Sep 17, 2020 · b5a4269 · b5a4269
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commit b5a4269
Showing 1 changed file with 5 additions and 0 deletions.
diff --git a/dev_tools/conf/pip-list-dev-tools.txt b/dev_tools/conf/pip-list-dev-tools.txt
@@ -24,6 +24,11 @@ qiskit~=0.20.0
 pypandoc
 myst-parser
 Sphinx~=3.2.0
+
+# have to pin otherwise RTD fails
+# see https://github.com/readthedocs/readthedocs.org/issues/7492
+Pygments==2.6.1
+
 sphinx_rtd_theme
 sphinx-markdown-tables