Added "The Unlicense" OSI Approved license #48 (#49)

* Added "The Unlicense" OSI Approved license

#48

* Added SPDX indentifier to The Unlicense

Added SPDX indentifier to "License :: OSI Approved :: The Unlicense"

Author: sTiKyt

src/trove_classifiers/__init__.py

@@ -244,6 +244,7 @@
     "License :: OSI Approved :: Sleepycat License",
     "License :: OSI Approved :: Sun Industry Standards Source License (SISSL)",
     "License :: OSI Approved :: Sun Public License",
+    "License :: OSI Approved :: The Unlicense (Unlicense)",
     "License :: OSI Approved :: Universal Permissive License (UPL)",
     "License :: OSI Approved :: University of Illinois/NCSA Open Source License",
     "License :: OSI Approved :: Vovida Software License 1.0",