Read python version from pyproject.toml (fix #542) (#669)

.licenses/npm/@iarna/toml.dep.yml

@@ -0,0 +1,26 @@
+---
+name: "@iarna/toml"
+version: 2.2.5
+type: npm
+summary: Better TOML parsing and stringifying all in that familiar JSON interface.
+homepage: https://github.com/iarna/iarna-toml#readme
+license: isc
+licenses:
+- sources: LICENSE
+  text: |+
+    Copyright (c) 2016, Rebecca Turner <me@re-becca.org>
+
+    Permission to use, copy, modify, and/or distribute this software for any
+    purpose with or without fee is hereby granted, provided that the above
+    copyright notice and this permission notice appear in all copies.
+
+    THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+    WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+    MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+    ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+    WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+    ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+    OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+
+notices: []
+...