pin ruamel.yaml package version

set upper bound for ruamel.yaml version,
same as schema_salad.

Author: manu-chroma

requirements.txt

@@ -1,5 +1,5 @@
 requests>=1.0
-ruamel.yaml==0.13.7
+ruamel.yaml<0.15
 rdflib==4.2.2
 rdflib-jsonld==0.4.0
 shellescape==3.4.1

setup.py

@@ -54,7 +54,7 @@
       install_requires=[
           'setuptools',
           'requests >= 1.0',
-          'ruamel.yaml >= 0.12.4',
+          'ruamel.yaml >= 0.12.4, < 0.15',
           'rdflib >= 4.2.2, < 4.3.0',
           'shellescape >= 3.4.1, < 3.5',
           'schema-salad >= 2.6, < 3',