jmbitcoin: eliminate dependency on urldecode

urllib.parse.unquote_plus() serves the same purpose as
url_decode.urldecode(), and moreover it correctly decodes UTF-8
sequences into Unicode characters rather than generating mojibake.

jmbitcoin/jmbitcoin/bip21.py

@@ -4,8 +4,7 @@
 # this are expected to do address validation independently anyway.
 
 from jmbitcoin import amount_to_sat
-from urllib.parse import quote, parse_qs, urlencode, urlparse
-from url_decode import urldecode
+from urllib.parse import parse_qs, quote, unquote_plus, urlencode, urlparse
 import re
 
 
@@ -40,7 +39,7 @@ def decode_bip21_uri(uri):
             # Convert amount to sats, as used internally by JM
             result['amount'] = amount_to_sat(amount_str + "btc")
         else:
-            result[key] = urldecode(params[key][0])
+            result[key] = unquote_plus(params[key][0])
     return result
 
 

jmbitcoin/setup.py

@@ -10,5 +10,5 @@ setup(name='joinmarketbitcoin',
       license='GPL',
       packages=['jmbitcoin'],
       python_requires='>=3.6',
-      install_requires=['python-bitcointx==1.1.3', 'pyaes', 'urldecode'],
+      install_requires=['python-bitcointx==1.1.3', 'pyaes'],
       zip_safe=False)