Fix preamble in BIP 301

Author: luke-jr

bip-0301.mediawiki

@@ -1,15 +1,15 @@
 <pre>
-    BIP: 301
-    Layer: Consensus (soft fork)
-    Title: Blind Merged Mining (Consensus layer)
-    Author: Paul Sztorc <[email protected]>
-            CryptAxe <[email protected]>
-    Comments-Summary: No comments yet.
-    Comments-URI: https://github.com/bitcoin/bips/wiki/Comments:BIP-301
-    Status: Draft
-    Type: Standards Track
-    Created: 2019-07-23
-    License: BSD-2-Clause
+  BIP: 301
+  Layer: Consensus (soft fork)
+  Title: Blind Merged Mining (Consensus layer)
+  Author: Paul Sztorc <[email protected]>
+          CryptAxe <[email protected]>
+  Comments-Summary: No comments yet.
+  Comments-URI: https://github.com/bitcoin/bips/wiki/Comments:BIP-0301
+  Status: Draft
+  Type: Standards Track
+  Created: 2019-07-23
+  License: BSD-2-Clause
 </pre>
 
 ==Abstract==