Update setup.py

Author: spderosso

setup.py

@@ -69,8 +69,8 @@
     install_requires=[
       # make sure it matches requirements.txt 
       'pygit2==0.26.4', # requires libgit2 0.26
-      'clint==0.5.1',
-      'sh==1.12.14' if sys.platform != 'win32' else 'pbs==0.110'
+      'clint>=0.3.6',
+      'sh>=1.11' if sys.platform != 'win32' else 'pbs>=0.11'
     ],
     license='MIT',
     classifiers=(