Add stefanomarty v.0.15.0.0 sigs

v0.15.0.0-android/stefanomarty/monero-android-0.15-build.assert.sig

@@ -0,0 +1,16 @@
+-----BEGIN PGP SIGNATURE-----
+
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+fj/PsT7+pTZS0fhoUiky66X3aKv9vr7tsLBQngNPVzs7UajqlVE=
+=tjSe
+-----END PGP SIGNATURE-----

v0.15.0.0-linux/stefanomarty/monero-linux-0.15-build.assert.sig

@@ -0,0 +1,16 @@
+-----BEGIN PGP SIGNATURE-----
+
+iQIzBAABCAAdFiEEQ+D+upeGs9iDZeQ9Vmty/IEAW0UFAl3NMSAACgkQVmty/IEA
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+NCvEOCLj5dEMVTJO/YGVegltCI+4aV6E8vtp/FdzszDP/V+vq2F2SfD85PIQiIwr
+daj5/+q+i/wUUYytNMnoh/57wwoJHD/T+fM1CRWtgxRNUwS/mky7CjVSr5k8LCis
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+zjLzUQsg4lkV/RiKJYGN1vAGFAez9obsFa/aNcsbPWNZ5pY5Gc8=
+=0SIu
+-----END PGP SIGNATURE-----

v0.15.0.0-win/stefanomarty/monero-win-0.15-build.assert.sig

@@ -0,0 +1,16 @@
+-----BEGIN PGP SIGNATURE-----
+
+iQIzBAABCAAdFiEEQ+D+upeGs9iDZeQ9Vmty/IEAW0UFAl3NMT0ACgkQVmty/IEA
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+H5YdKQ7yOf3njLd7ya/hB0lRBMu7I/ycb5/TgZoPk7vGI8F8XkkXAvIqmCFFzHMD
+xWOidZEDFk0L9VTvRdn5BeW8DqHyYNut2KIRub8kWUssT+9Gn0Q=
+=h883
+-----END PGP SIGNATURE-----