typo.

Author: PGijsbers

setup.py

@@ -6,7 +6,7 @@
 with open("openml/__version__.py") as fh:
     version = fh.readlines()[-1].split()[-1].strip("\"'")
 
-# Using Python setup.py install will try to build numpy which prone to failure and
+# Using Python setup.py install will try to build numpy which is prone to failure and
 # very time consuming anyway.
 if len(sys.argv) > 1 and sys.argv[1] == 'install':
     print('Please install this package with pip: `pip install -e .` '