Update README.md

README.md

-# gab-open-source
+# Gab Open Source
 
-Landing page for code.gab.com
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+Gab Social (at gab.com) is forked from / based on Mastodon, an AGPL licensed software. Accordingly, we will make available the source for Gab Social upon request. Please email opensource@gab.com to receive a download link.