Better tx feerate formatting

jmbitcoin/jmbitcoin/amount.py

@@ -60,4 +60,5 @@ def sat_to_str_p(sat):
 
 
 def fee_per_kb_to_str(feerate):
-    return str(feerate) + " sat/vkB (" + str(feerate / 1000) + " sat/vB)"
+    return (str(int(feerate)) + " sat/vkB (" +
+        '%.1f' % (int(feerate / 100) / 10) + " sat/vB)")

jmbitcoin/test/test_amounts.py

@@ -112,3 +112,5 @@ def test_sat_to_str_p():
 
 def test_fee_per_kb_to_str():
     assert(btc.fee_per_kb_to_str(1000) == "1000 sat/vkB (1.0 sat/vB)")
+    assert(btc.fee_per_kb_to_str(1234) == "1234 sat/vkB (1.2 sat/vB)")
+    assert(btc.fee_per_kb_to_str(1999) == "1999 sat/vkB (1.9 sat/vB)")