removed non-existent file from setup

setup.py

@@ -20,7 +20,7 @@ from setuptools import setup
 
 setup(
   data_files=[
-    ( "share/doc/nanovnasaver/", [ "CHANGELOG.md", "LICENSE", "README.md" ] ),
+    ( "share/doc/nanovnasaver/", [ "LICENSE", "README.md" ] ),
     ( "share/applications/", [ "NanoVNASaver.desktop" ] ),
     ( "share/icons/hicolor/48x48/apps/", [ "NanoVNASaver_48x48.png" ] ),
   ]