pin working pathlib2 version

Author: mr-c

requirements.txt

@@ -5,4 +5,4 @@ rdflib-jsonld==0.4.0
 shellescape==3.4.1
 schema-salad>=2.6,<3
 typing==3.5.3
-pathlib2; python_version<"3"
+pathlib2==2.3.2; python_version<"3"

setup.py

@@ -60,7 +60,7 @@
       extras_require={
           ':python_version<"3" and platform_system=="Linux"':
           ['subprocess32 == 3.5.0rc1'],
-          ':python_version<"3"': ['pathlib2'],
+          ':python_version<"3"': ['pathlib2 == 2.3.2'],
           'deps': ["galaxy-lib >= 17.09.3"]
       },
       python_requires='>=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, <4',