Merge pull request #106 from JohanMabille/upgrade_xtensor

UPgraded to xtensor 0.25

Author: JohanMabille

environment-dev.yml

@@ -10,7 +10,7 @@ dependencies:
   - cppzmq
   - xproperty=0.12.0
   - xwidgets=0.29.0
-  - xtensor=0.24.3
+  - xtensor=0.25
   # Test dependencies
   - doctest
   - pybind11=2.7.1