use yaml.safe_load()

getting new warnings
see https://github.com/yaml/pyyaml/wiki/PyYAML-yaml.load(input)-Deprecation

brozzler/__init__.py

@@ -106,7 +106,7 @@ def behaviors(behaviors_dir=None):
         d = behaviors_dir or os.path.dirname(__file__)
         behaviors_yaml = os.path.join(d, 'behaviors.yaml')
         with open(behaviors_yaml) as fin:
-            _behaviors = yaml.load(fin)
+            _behaviors = yaml.safe_load(fin)
     return _behaviors
 
 def behavior_script(url, template_parameters=None, behaviors_dir=None):

brozzler/model.py

@@ -35,7 +35,7 @@ import yaml
 def load_schema():
     schema_file = os.path.join(os.path.dirname(__file__), 'job_schema.yaml')
     with open(schema_file) as f:
-        return yaml.load(f)
+        return yaml.safe_load(f)
 
 class JobValidator(cerberus.Validator):
     def _validate_type_url(self, value):
@@ -68,7 +68,7 @@ def new_job_file(frontier, job_conf_file):
     '''Returns new Job.'''
     logging.info("loading %s", job_conf_file)
     with open(job_conf_file) as f:
-        job_conf = yaml.load(f)
+        job_conf = yaml.safe_load(f)
         return new_job(frontier, job_conf)
 
 def new_job(frontier, job_conf):

setup.py

@@ -2,7 +2,7 @@
 '''
 setup.py - brozzler setup script
 
-Copyright (C) 2014-2018 Internet Archive
+Copyright (C) 2014-2019 Internet Archive
 
 Licensed under the Apache License, Version 2.0 (the "License");
 you may not use this file except in compliance with the License.
@@ -32,7 +32,7 @@ def find_package_data(package):
 
 setuptools.setup(
         name='brozzler',
-        version='1.5.1',
+        version='1.5.2',
         description='Distributed web crawling with browsers',
         url='https://github.com/internetarchive/brozzler',
         author='Noah Levitt',
@@ -98,6 +98,7 @@ setuptools.setup(
             'Programming Language :: Python :: 3.4',
             'Programming Language :: Python :: 3.5',
             'Programming Language :: Python :: 3.6',
+            'Programming Language :: Python :: 3.7',
             'Topic :: Internet :: WWW/HTTP',
             'Topic :: System :: Archiving',
         ])

tests/test_units.py

@@ -151,7 +151,7 @@ def test_robots_connection_failure():
     assert brozzler.is_permitted_by_robots(site, url)
 
 def test_scoping():
-    test_scope = yaml.load('''
+    test_scope = yaml.safe_load('''
 max_hops: 100
 accepts:
 - url_match: REGEX_MATCH