Revert "updated PyYAML"

This reverts commit 08142f4. The PyYAML has been released with bad version... therefore I should revert the update. Evidence of existence of v4.1: https://travis-ci.org/andras-tim/octoconf/jobs/397344811#L546
andras-tim · Jul 6, 2018 · 5406316 · 5406316
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diff --git a/CHANGELOG.md b/CHANGELOG.md
@@ -7,6 +7,9 @@ This project adheres to [Semantic Versioning](http://semver.org/).
 ### Changed
 - Updated dependencies
 
+### Fixed
+- Fixed version of PyYAML (reverted to 3.x)
+
 
 ## [0.2.1] - 2018-06-27
 ### Changed

diff --git a/requirements.txt b/requirements.txt
@@ -1 +1 @@
-PyYAML>=4.1,<4.2
+PyYAML>=3.11,<4.0