fix import

Author: tompollard

setup.py

@@ -55,7 +55,8 @@
         'nose>=1.3.7',
         'numpy>=1.11.0',
         'matplotlib>=1.5.1',
-        'cairocffi>=0.7.2'
+        'cairocffi>=0.7.2',
+        'configparser>=3.5.0'
         ],
 
     # List additional groups of dependencies here (e.g. development

wfdb/plotwfdb.py

@@ -1,5 +1,5 @@
 import numpy as np
-from wfdb import readsignal
+import readsignal
 import matplotlib.pyplot as plt