Relax ruamel.yaml pin (#262)

Author: tetron

requirements.txt

@@ -1,9 +1,9 @@
 requests>=1.0
-ruamel.yaml==0.12.4
+ruamel.yaml==0.13.7
 rdflib==4.2.1
 rdflib-jsonld==0.4.0
 shellescape==3.4.1
-schema-salad>=2.1.20161216210732,<3
+schema-salad>=2.1.20161227155225,<3
 cwltest>=1.0.20160907111242
 typing==3.5.2.2 ; python_version>="2.7"
 pathlib2==2.1.0

setup.py

@@ -44,10 +44,10 @@
       install_requires=[
           'setuptools',
           'requests >= 1.0',
-          'ruamel.yaml >= 0.12.4, < 0.12.5',
+          'ruamel.yaml >= 0.12.4',
           'rdflib >= 4.2.0, < 4.3.0',
           'shellescape >= 3.4.1, < 3.5',
-          'schema-salad >= 2.1.20161221160224, < 3',
+          'schema-salad >= 2.1.20161227191302, < 3',
           'typing >= 3.5.2, < 3.6',
           'cwltest >= 1.0.20160907111242',
           'pathlib2 >= 2.1.0'