Relicense as zlib.

LICENSE.txt

@@ -1,19 +1,17 @@
-Copyright (c) 2016-2017 Antony Lee
+Copyright (c) 2016-present Antony Lee
 
-Permission is hereby granted, free of charge, to any person obtaining a copy of
-this software and associated documentation files (the "Software"), to deal in
-the Software without restriction, including without limitation the rights to
-use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
-of the Software, and to permit persons to whom the Software is furnished to do
-so, subject to the following conditions:
+This software is provided 'as-is', without any express or implied
+warranty. In no event will the authors be held liable for any damages
+arising from the use of this software.
 
-The above copyright notice and this permission notice shall be included in all
-copies or substantial portions of the Software.
+Permission is granted to anyone to use this software for any purpose,
+including commercial applications, and to alter it and redistribute it
+freely, subject to the following restrictions:
 
-THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
-IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
-FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
-THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
-LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
-OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
-SOFTWARE.
+1. The origin of this software must not be misrepresented; you must not
+   claim that you wrote the original software. If you use this software
+   in a product, an acknowledgment in the product documentation would be
+   appreciated but is not required.
+2. Altered source versions must be plainly marked as such, and must not be
+   misrepresented as being the original software.
+3. This notice may not be removed or altered from any source distribution.

setup.py

@@ -8,11 +8,11 @@
     long_description_content_type="text/x-rst",
     author="Antony Lee",
     url="https://github.com/anntzer/ipython-autoimport",
-    license="MIT",
+    license="zlib",
     classifiers=[
         "Development Status :: 4 - Beta",
         "Framework :: IPython",
-        "License :: OSI Approved :: MIT License",
+        "License :: OSI Approved :: zlib/libpng License",
         "Programming Language :: Python :: 3",
     ],
     py_modules=["ipython_autoimport"],