Merge pull request xtensor-stack#229 from JohanMabille/upgrade

Upgraded to xtensor 0.21.2

Author: JohanMabille

.appveyor.yml

@@ -22,7 +22,7 @@ install:
   - conda update -q conda
   - conda info -a
   - conda install gtest cmake -c conda-forge
-  - conda install pytest numpy pybind11==2.4.3 xtensor==0.21.1 -c conda-forge
+  - conda install pytest numpy pybind11==2.4.3 xtensor==0.21.2 -c conda-forge
   - "set PYTHONHOME=%MINICONDA%"
   - cmake -G "NMake Makefiles" -D CMAKE_INSTALL_PREFIX=%MINICONDA%\\Library -D BUILD_TESTS=ON -D PYTHON_EXECUTABLE=%MINICONDA%\\python.exe .
   - nmake test_xtensor_python

.travis.yml

@@ -156,7 +156,7 @@ install:
       else
         conda install pybind11==${PYBIND11_VERSION} -c conda-forge
       fi
-    - conda install xtensor==0.21.1 -c conda-forge
+    - conda install xtensor==0.21.2 -c conda-forge
     - cmake -D DOWNLOAD_GTEST=ON -D CMAKE_INSTALL_PREFIX=$HOME/miniconda -D PYTHON_EXECUTABLE=$PY_EXE .
     - make -j2 test_xtensor_python
     - make install