updating setup.cfg fields

the current setup.cfg has several fields with dashes
(-) that will soon be deprecated. The warning message
alerts to change these to underscores.

Signed-off-by: vsoch <[email protected]>

Author: vsoch

setup.cfg

@@ -7,11 +7,11 @@
 [metadata]
 name = tern
 author = VMware Inc
-author-email = nishak@vmware.com
+author_email = nishak@vmware.com
 summary = An inspection tool to find the OSS compliance metadata of the packages installed in a container image.
-long-description = file: README.md
-long-description-content-type = text/markdown; charset=UTF-8
-home-page = https://github.com/tern-tools/tern/
+long_description = file: README.md
+long_description_content_type = text/markdown; charset=UTF-8
+home_page = https://github.com/tern-tools/tern/
 project_urls =
     Documentation = https://github.com/tern-tools/tern/tree/master/docs
     Source Code = https://github.com/tern-tools/tern