Update `classifiers`: remove outdated

setup.py

@@ -86,7 +86,7 @@ setup(
     cmdclass={
         'build_py': CustomBuildExtCommand,
     },
-    classifiers=[
+    classifiers=[ # https://pypi.python.org/pypi?%3Aaction=list_classifiers
         "Development Status :: 5 - Production/Stable",
         "Environment :: Console",
         "Environment :: Web Environment",
@@ -95,6 +95,5 @@ setup(
         "Programming Language :: Python :: 3",
         "Topic :: Multimedia :: Graphics :: Editors :: Vector-Based",
         "Topic :: Scientific/Engineering",
-        "Topic :: Scientific/Engineering :: Computer Aided Design",
     ],
     keywords=["boxes", "box", "generator", "svg", "laser cutter"], )