Fix conf.py

Author: antusus

docs/source/conf.py

@@ -56,10 +56,10 @@
 try:
     release = pkg_resources.get_distribution('boxsdk').version
 except pkg_resources.DistributionNotFound:
-    print 'To build the documentation, The distribution information of boxsdk'
-    print 'Has to be available.  Either install the package into your'
-    print 'development environment or run "setup.py develop" to setup the'
-    print 'metadata.  A virtualenv is recommended!'
+    print('To build the documentation, The distribution information of boxsdk')
+    print('Has to be available.  Either install the package into your')
+    print('development environment or run "setup.py develop" to setup the')
+    print('metadata.  A virtualenv is recommended!')
     sys.exit(1)
 del pkg_resources