releases: in-repo v0.4.2 archives for users who can't reach GitHub Releases

Mirror of the GitHub Release assets for all platforms, committed into
releases/ so that users behind a network that blocks the Releases page
can still grab the binaries via 'Download ZIP' or 'git clone'. Same
pattern as the sni-spoofing-rust repo.

releases/.gitattributes

@@ -0,0 +1,2 @@
+*.tar.gz binary
+*.zip binary