Fix netcdf4 version

Author: matteobachetti

tox.ini

@@ -58,7 +58,7 @@ deps =
     devdeps: pyerfa>=0.0.dev
     devpint: git+https://github.com/nanograv/pint.git#egg=pint-pulsar
     devdeps: git+https://github.com/stingraysoftware/stingray.git#egg=stingray
-    alldeps: netcdf4==1.7.0
+    ; alldeps: netcdf4==1.7.0
     mpi: mpi4py