Fix LICENSE file

The ACKNOWLEDGEMENTS field contains the gist of the previous contents,
i.e. acknowledgement that early versions of the package were intended as
a port for a Python library. Hopefully this is enough to cover their BSD
3-Clause licence requirements.

LICENSE

@@ -1,30 +1,6 @@
-BSD 3-Clause License
-
-R package: Copyright (c) 2022, Mark Webster.
-autonormalize Python library, heavily modified for starting codebase: Copyright (c) 2019, Feature Labs, Inc.
-All rights reserved.
-
-Redistribution and use in source and binary forms, with or without
-modification, are permitted provided that the following conditions are met:
-
-* Redistributions of source code must retain the above copyright notice, this
-  list of conditions and the following disclaimer.
-
-* Redistributions in binary form must reproduce the above copyright notice,
-  this list of conditions and the following disclaimer in the documentation
-  and/or other materials provided with the distribution.
-
-* Neither the name of the copyright holder nor the names of its
-  contributors may be used to endorse or promote products derived from
-  this software without specific prior written permission.
-
-THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
-AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
-IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
-DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
-FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
-DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
-SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
-CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
-OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+YEAR: 2022
+COPYRIGHT HOLDER: Mark Webster
+ORGANIZATION: copyright holder
+ACKNOWLEDGEMENTS: Early versions originally ported from the autonormalize Python
+  library under BSD 3-Clause license, Copyright (c) 2019, Feature Labs, Inc.
+  This is under the same license, so the text is not replicated here.