fix for python38 with export_text

Author: erdogant

treeplot/__init__.py

@@ -8,7 +8,7 @@
 
 __author__ = 'Erdogan Tasksen'
 __email__ = '[email protected]'
-__version__ = '0.1.12'
+__version__ = '0.1.13'
 
 # module level doc-string
 __doc__ = """

treeplot/treeplot.py

@@ -13,7 +13,8 @@
 import zipfile
 import numpy as np
 from sklearn.tree import export_graphviz
-from sklearn.tree.export import export_text
+# from sklearn.tree.export import export_text
+from sklearn.tree import export_text
 from subprocess import call
 import matplotlib.image as mpimg
 import matplotlib.pyplot as plt