remove semantic_version package

Author: m-vdb

poetry.lock

@@ -146,7 +146,6 @@ azure-storage-blob = "^12.1.0"
 coveralls = "^2.0.0"
 towncrier = "^19.2.0"
 toml = "^0.10.0"
-semantic_version = "^2.8.4"
 sphinx = "^3.0.0"
 sphinx-autobuild = "~0.7.1"
 sphinxcontrib-programoutput = "==0.11"