requirements-dev: pin PyYAML fo Python 2.6 (#606)

pyyaml 5.1 deprecated Python 2.6 support: https://pyyaml.org/wiki/PyYAML
pynamodb · Mar 31, 2019 · 79fd479 · 79fd479
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commit 79fd479
Showing 1 changed file with 1 addition and 0 deletions.
diff --git a/requirements-dev.txt b/requirements-dev.txt
@@ -18,6 +18,7 @@ tox==2.1.1
 blinker==1.4
 flake8==2.4.1
 requests==2.7.0
+pyyaml<5  # for Python 2.6 support -- remove once we cease Python 2.6 support
 # Pinned because latest version requires Python 2.7+ (https://github.com/sphinx-doc/sphinx/issues/2919).
 sphinx==1.5.6
 sphinx-rtd-theme==0.1.8