Fixed typo.

Author: ocefpaf

setup.py

@@ -55,7 +55,7 @@ def read(*filenames, **kwargs):
                            'Topic :: Education',
                            'Topic :: Scientific/Engineering',
                            ],
-              description='Gibbs SeaWater Oceanographic Package of TEOS-10',
+              description='Gibbs Seawater Oceanographic Package of TEOS-10',
               author=authors,
               author_email=email,
               maintainer=maintainer,