Fix missing file during install

MANIFEST.in

 include AUTHORS
 include CONTRIBUTING.md
 include COPYING
-include NEWS
+include NEWS.rst
 include README.rst
 include conf/glances.conf
 recursive-include docs *

setup.py

@@ -32,7 +32,7 @@ with open('README.rst', encoding='utf-8') as f:
 
 def get_data_files():
     data_files = [
-        ('share/doc/glances', ['AUTHORS', 'COPYING', 'NEWS', 'README.rst',
+        ('share/doc/glances', ['AUTHORS', 'COPYING', 'NEWS.rst', 'README.rst',
                                'CONTRIBUTING.md', 'conf/glances.conf']),
         ('share/man/man1', ['docs/man/glances.1'])
     ]