v1.6.0 pre-release

Author: Jeff Whitaker

.github/workflows/build-wheels.yml

@@ -50,7 +50,7 @@ jobs:
       REPO_DIR: netcdf4-python
       PKG_NAME: netcdf4-python
       MB_ML_VER: 2014
-      BUILD_COMMIT: v1.5.8rel
+      BUILD_COMMIT: v1.6.0pre
       UNICODE_WIDTH: 32
       MB_PYTHON_VERSION: ${{ matrix.python-version }}
       TRAVIS_PYTHON_VERSION: ${{ matrix.python-version }}