Update to python3, bump versions
Change-Id: I9a62f81f9462083e11757cc1254c40f9dca5785e
diff --git a/requirements.txt b/requirements.txt
index d523bef..6f4c716 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,22 +1,22 @@
-Sphinx~=1.8.5
-actdiag~=0.5.4
+Sphinx~=2.4.3
+actdiag~=2.0.0
blockdiag~=1.5.4
doc8~=0.8.0
livereload~=2.6.1
-nwdiag~=1.0.4
+nwdiag~=2.0.0
recommonmark~=0.6.0
-seqdiag~=0.9.6
+seqdiag~=2.0.0
sphinx-reload~=0.2.0
sphinx-rtd-theme~=0.4.3
-sphinxcontrib-actdiag~=0.8.5
-sphinxcontrib-blockdiag~=1.5.5
-sphinxcontrib-nwdiag~=0.9.5
-sphinxcontrib-openapi~=0.5.0
-sphinxcontrib-seqdiag~=0.8.5
-sphinxcontrib-spelling~=4.2.1
+sphinxcontrib-actdiag~=2.0.0
+sphinxcontrib-blockdiag~=2.0.0
+sphinxcontrib-nwdiag~=2.0.0
+sphinxcontrib-openapi~=0.6.0
+sphinxcontrib-seqdiag~=2.0.0
+sphinxcontrib-spelling~=4.3.0
# using a fork as the main branch is broken in newer sphinx, per:
# https://github.com/sphinx-contrib/sphinxcontrib-versioning/issues/58
# also added functionality to support working with other repos
git+https://github.com/zdw/sphinxcontrib-versioning@0998d870b2791eb6343c98e98d6680c1e727daee
# sphinx-autoapi~=1.2.1
-# sphinxcontrib-golangdomain
+# sphinxcontrib-golangdomain==0.2.0.dev0