Add michagogo to gitian download scripts

contrib/gitian-downloader/linux-download-config

@@ -39,4 +39,8 @@ signers:
     weight: 40
     name: "Warren Togami"
     key: wtogami
+  9692B91BBF0E8D34DFD33B1882C5C009628ECF0C:
+    weight: 11
+    name: michagogo
+    key: michagogo
 minimum_weight: 120

contrib/gitian-downloader/michagogo-key.pgp

@@ -0,0 +1,27 @@
+-----BEGIN PGP PUBLIC KEY BLOCK-----
+Version: SKS 1.1.0
+
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++DferdBvS2VYoWGxKDvj3OSGhzwVeVS3kd0wdS554x1X/xcIvHJxsudJDVo3GzMhA2o=
+=YdfZ
+-----END PGP PUBLIC KEY BLOCK-----

contrib/gitian-downloader/win32-download-config

@@ -39,4 +39,8 @@ signers:
     weight: 40
     name: "Warren Togami"
     key: wtogami
+  9692B91BBF0E8D34DFD33B1882C5C009628ECF0C:
+    weight: 11
+    name: michagogo
+    key: michagogo
 minimum_weight: 120