Merge #255: musig: change test vector generation code shebang from py…

…thon to python3

ea478be musig: change test vector generation code shebang from python to python3 (Jonas Nick)

Pull request description:

  The linter included in the Bitcoin Core and Elements test framework requires python3.

ACKs for top commit:
  real-or-random:
    utACK ea478be

Tree-SHA512: 0174e9d72529d1aa2c7a0542bc49a21af9163715961fa042da39c9bb857259f4c7e2b9be8e30b77c7b9b420574bd15f76308d807e22bdc590a91d249cca5ae86

contrib/musig2-vectors.py

@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 import sys
 import json