Merge pull request conda-forge#175 from ocefpaf/update_pins

Update pinnings

Author: ocefpaf

scripts/pin_the_slow_way.py

@@ -39,10 +39,12 @@
           'libblitz': 'libblitz 0.10|0.10.*',
           'libmatio': 'libmatio 1.5.*',
           'libnetcdf': 'libnetcdf 4.4.*',
-          'libpng': 'libpng >=1.6.21,<1.7',
+          'libpng': 'libpng >=1.6.23,<1.7',
           'libsvm': 'libsvm 3.21|3.21.*',
           'libtiff': 'libtiff 4.0.*',
           'ncurses': 'ncurses 5.9*',
+          'netcdf-cxx4': 'netcdf-cxx4 4.3.*',
+          'netcdf-fortran': 'netcdf-fortran 4.4.*',
           'openblas': 'openblas 0.2.18|0.2.18.*',
           'openssl': 'openssl 1.0.*',
           'proj.4': 'proj.4 4.9.3',