DOC: Update to https links

Author: tbirdso

LICENSE

@@ -1,7 +1,7 @@
 
                                  Apache License
                            Version 2.0, January 2004
-                        http://www.apache.org/licenses/
+                        https://www.apache.org/licenses/
 
    TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION
 
@@ -193,7 +193,7 @@
    you may not use this file except in compliance with the License.
    You may obtain a copy of the License at
 
-       http://www.apache.org/licenses/LICENSE-2.0
+       https://www.apache.org/licenses/LICENSE-2.0
 
    Unless required by applicable law or agreed to in writing, software
    distributed under the License is distributed on an "AS IS" BASIS,

README.md

@@ -10,7 +10,7 @@ H & E ([hematoxylin](https://en.wikipedia.org/wiki/Haematoxylin) and [eosin](htt
 
 Structure Preserving Color Normalization is a technique described in [Vahadane et al., 2016](https://doi.org/10.1109/TMI.2016.2529665) and modified in [Ramakrishnan et al., 2019](https://arxiv.org/abs/1901.03088).  The idea is to model the color of an image pixel as something close to pure white, which is reduced in intensity in a color-specific way via an optical absorption model that depends upon the amounts of hematoxylin and eosin that are present.  [Non-negative matrix factorization](https://en.wikipedia.org/wiki/Non-negative_matrix_factorization) is used on each analyzed image to simultaneously derive the amount of hematoxylin and eosin stain at each pixel and the image-wide effective colors of each stain.
 
-The implementation in ITK accelerates the non-negative matrix factorization by choosing the initial estimate for the color absorption characteristics using a technique mimicking that presented in [Arora et al., 2013](http://proceedings.mlr.press/v28/arora13.html) and modified in [Newberg et al., 2018](https://doi.org/10.1371/journal.pone.0193067).  This approach finds a good solution for a non-negative matrix factorization by first transforming it to the problem of finding a convex hull for a set of points in a cloud.
+The implementation in ITK accelerates the non-negative matrix factorization by choosing the initial estimate for the color absorption characteristics using a technique mimicking that presented in [Arora et al., 2013](https://proceedings.mlr.press/v28/arora13.html) and modified in [Newberg et al., 2018](https://doi.org/10.1371/journal.pone.0193067).  This approach finds a good solution for a non-negative matrix factorization by first transforming it to the problem of finding a convex hull for a set of points in a cloud.
 
 The lead developer of InsightSoftwareConsortium/ITKColorNormalization is [Lee Newberg](https://github.com/Leengit/).
 

include/itkStructurePreservingColorNormalizationFilter.h

@@ -6,7 +6,7 @@
  *  you may not use this file except in compliance with the License.
  *  You may obtain a copy of the License at
  *
- *         http://www.apache.org/licenses/LICENSE-2.0.txt
+ *         https://www.apache.org/licenses/LICENSE-2.0.txt
  *
  *  Unless required by applicable law or agreed to in writing, software
  *  distributed under the License is distributed on an "AS IS" BASIS,

include/itkStructurePreservingColorNormalizationFilter.hxx

@@ -6,7 +6,7 @@
  *  you may not use this file except in compliance with the License.
  *  You may obtain a copy of the License at
  *
- *         http://www.apache.org/licenses/LICENSE-2.0.txt
+ *         https://www.apache.org/licenses/LICENSE-2.0.txt
  *
  *  Unless required by applicable law or agreed to in writing, software
  *  distributed under the License is distributed on an "AS IS" BASIS,

test/itkStructurePreservingColorNormalizationFilterTest.cxx

@@ -6,7 +6,7 @@
  *  you may not use this file except in compliance with the License.
  *  You may obtain a copy of the License at
  *
- *         http://www.apache.org/licenses/LICENSE-2.0.txt
+ *         https://www.apache.org/licenses/LICENSE-2.0.txt
  *
  *  Unless required by applicable law or agreed to in writing, software
  *  distributed under the License is distributed on an "AS IS" BASIS,