Piwik is now Matomo (#206)

* Piwik is now Matomo

https://matomo.org/blog/2018/01/piwik-is-now-matomo/

* Update LEGALNOTICE

* Update import_logs.py

LEGALNOTICE

@@ -1,6 +1,6 @@
 COPYRIGHT
 
-  Piwik - free/libre analytics platform
+  Matomo - free/libre analytics platform
 
   The software package is:
 
@@ -12,15 +12,15 @@ COPYRIGHT
 
 SOFTWARE LICENSE
 
-  The free software license of Piwik is GNU General Public License v3
+  The free software license of Matomo is GNU General Public License v3
   or later.  A copy of GNU GPL v3 should have been included in this
   software package in LICENCE.txt.
 
 
 TRADEMARK
 
-  Piwik (TM) is an internationally registered trademark.
+  Matomo (TM) is an internationally registered trademark.
 
   The software license does not grant any rights under trademark
-  law for use of the trademark.  Refer to https://piwik.org/trademark/
+  law for use of the trademark.  Refer to https://matomo.org/trademark/
   for up-to-date trademark licensing information.