rename the "USAGES" to "USAGE"

fix the test case
update the README text

Author: chinyeungli

README.rst

@@ -187,6 +187,8 @@ from the /tmp/thirdparty_about/ and then generate the attribution output to
 /tmp/thirdparty_attribution/attribution.html
 
 
+(See USAGE for a details explaining of each scripts and options.)
+
 HELP and SUPPORT
 ----------------
 If you have a question or find a bug, enter a ticket at:

USAGES USAGEUSAGES renamed to USAGE

@@ -61,9 +61,9 @@ def test_get_non_empty_rows_list(self):
 
     def test_get_mapping_list(self):
         gen = genabout.GenAbout()
-        expected_list = {'about_file': 'Directory/Filename',
-                          'version': 'Confirmed Version',
-                           'about_resource': 'file_name', 'name': 'Component'}
+        expected_list = {'about_file': 'directory/filename',
+                          'version': 'confirmed version',
+                           'about_resource': 'file_name', 'name': 'component'}
         output = gen.get_mapping_list()
         self.assertTrue(output == expected_list)