cleanup scripts

Fixes to make some scripts work again, and a comment about a confusing dependency to tslite.
Note the the functions in util.py no longer work and need fixing.

I'm keeping these scripts for their documentation value (minimalistic examples of how to connect to electrum servers).

scripts/README.md

@@ -0,0 +1,6 @@
+The scripts in this folder are meant as basic examples of how to use the electrum API.
+
+To test them, install Electrum ABC first as a python package on your system.
+From the root of the repository, run:
+
+    pip install .

scripts/bip70

@@ -1,6 +1,9 @@
 #!/usr/bin/env python3
 # create a BIP70 payment request signed with a certificate
 
+# Note that the tlslite package has not been updated since 2015, and no longer works
+# with recent python versions.
+# tlslite-ng is a drop-in replacement (`pip install tlslite-ng`)
 import tlslite
 
 from electrumabc import paymentrequest

scripts/util.py

@@ -3,8 +3,7 @@
 import time
 from collections import defaultdict
 
-from electrumabc import Connection  # fixme
-from electrumabc.interface import Interface
+from electrumabc.interface import Connection, Interface
 from electrumabc.network import parse_servers
 from electrumabc.simple_config import SimpleConfig