Use standard python logging infrastructure to log version warning message.

Author: ZoranPavlovic

src/pyocr/libtesseract/__init__.py

@@ -20,6 +20,9 @@
 from ..error import TesseractError
 from ..util import digits_only
 
+import logging
+logger = logging.getLogger(__name__)
+
 
 __all__ = [
     'can_detect_orientation',
@@ -218,7 +221,7 @@ def is_available():
     # not tested with 3.03
     if (version[0] < 3 or
             (version[0] == 3 and version[1] < 4)):
-        print("Unsupported version [%s]" % ".".join([str(r) for r in version]))
+        logger.warning("Unsupported version [%s]" % ".".join([str(r) for r in version]))
         return False
     return True