minor update

pyModeS/decoder/bds/bds17.py

@@ -46,7 +46,7 @@ def is17(msg):
 
     # basic BDS codes for ADS-B shall be supported
     #   assuming ADS-B out is installed (2017EU/2020US mandate)
-    if not set(['BDS05', 'BDS06', 'BDS09', 'BDS20']).issubset(caps):
+    if not set(['BDS05', 'BDS06', 'BDS08', 'BDS09', 'BDS20']).issubset(caps):
         return False
 
     return True

pyModeS/decoder/bds/bds20.py

@@ -36,9 +36,7 @@ def is20(msg):
 
     d = hex2bin(data(msg))
 
-    # status bit 1, 14, and 27
-
-    if bin2int(d[0:4]) != 2 or bin2int(d[4:8]) != 0:
+    if d[0:8] != '00100000':
         return False
 
     cs = cs20(msg)