change to fullargsspec (#288)

* change to fullargsspec

* python 2.7 fix

* import was reversed

* isort

* remove too many blank lines

* added comment

* better comment

docs/source/upload.py

@@ -1,7 +1,7 @@
 from __future__ import print_function
-from builtins import input
-from builtins import str
+
 import sys
+from builtins import input, str
 from subprocess import call
 
 from conf import release

featuretools/primitives/utils.py

@@ -1,4 +1,4 @@
-from inspect import getargspec, isclass
+from inspect import isclass
 
 import pandas as pd
 
@@ -7,6 +7,13 @@
 import featuretools.primitives
 from featuretools.utils import is_string
 
+try:
+    # python 3.7 deprecated getargspec
+    from inspect import getfullargspec as getargspec
+except ImportError:
+    # python 2.7 - 3.6 backwards compatibility import
+    from inspect import getargspec
+
 
 def apply_dual_op_from_feat(f, array_1, array_2=None):
     left = f.left