Add "Programming Language :: Zig" classifier (#218)

* Add `"Programming Language :: Zig"` classifier

* Sort classifiers; fix linting error

Author: agriyakhetarpal

src/trove_classifiers/__init__.py

@@ -560,6 +560,7 @@
     "Programming Language :: Visual Basic",
     "Programming Language :: XBasic",
     "Programming Language :: YACC",
+    "Programming Language :: Zig",
     "Programming Language :: Zope",
     "Topic :: Adaptive Technologies",
     "Topic :: Artistic Software",