bump schema_salad version

Author: mr-c

requirements.txt

@@ -3,5 +3,5 @@ ruamel.yaml==0.13.7
 rdflib==4.2.2
 rdflib-jsonld==0.4.0
 shellescape==3.4.1
-schema-salad>=2.4.20170308171942,<3
+schema-salad>=2.5.20170623152720,<3
 typing==3.5.2.2 ; python_version>="2.7"

setup.py

@@ -57,7 +57,7 @@
           'ruamel.yaml >= 0.12.4',
           'rdflib >= 4.2.2, < 4.3.0',
           'shellescape >= 3.4.1, < 3.5',
-          'schema-salad >= 2.4.20170308171942, < 3',
+          'schema-salad >= 2.5.20170623152720, < 3',
           'typing >= 3.5.2, < 3.6',
           'six >= 1.8.0',
       ],