add Oceanography to Scientific/Engineering (#149)

This seemed to be the place to add a new one -- please let me know if there's another way to propose a new classifier.

Note: we could do something like:
Met/Ocean Science, but there is already Atmospheric Science, I figured Oceanography made sense.

src/trove_classifiers/__init__.py

@@ -702,6 +702,7 @@
     "Topic :: Scientific/Engineering :: Interface Engine/Protocol Translator",
     "Topic :: Scientific/Engineering :: Mathematics",
     "Topic :: Scientific/Engineering :: Medical Science Apps.",
+    "Topic :: Scientific/Engineering :: Oceanography",
     "Topic :: Scientific/Engineering :: Physics",
     "Topic :: Scientific/Engineering :: Visualization",
     "Topic :: Security",