Update hashbang to use /usr/bin/env python

README.rst

@@ -12,7 +12,7 @@ also found in ``helloworld.py``
 
 .. code:: python
 
-  #!/usr/bin/python
+  #!/usr/bin/env python
 
   from trezorlib.client import TrezorClient
   from trezorlib.transport_hid import HidTransport

mnemonic_check.py

@@ -1,4 +1,4 @@
-#!/usr/bin/python
+#!/usr/bin/env python
 __doc__ = '''
     Use this script to cross-check that TREZOR generated valid
     mnemonic sentence for given internal (TREZOR-generated)