MAINT: add 3rd party license info to LICENSE

Author: grlee77

LICENSE

@@ -1,5 +1,5 @@
 Copyright (c) 2006-2012 Filip Wasilewski <http://en.ig.ma/>
-Copyright (c) 2012-2017 The PyWavelets Developers <https://github.com/PyWavelets/pywt>
+Copyright (c) 2012-2019 The PyWavelets Developers <https://github.com/PyWavelets/pywt>
 
 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
@@ -18,3 +18,15 @@ 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.
+
+
+The PyWavelets repository and source distributions bundle some code that is
+adapted from compatibly licensed projects. We list these here.
+
+Name: NumPy
+Files:  pywt/_pytesttester.py
+License: 3-clause BSD
+
+Name: SciPy
+Files:  setup.py, util/*
+License: 3-clause BSD