support Python 3.8

Author: mr-c

.travis.yml

@@ -24,7 +24,7 @@ jobs:
     - python: "3.5"
     - python: "3.6"
     - python: "3.7"
-    #- python: "3.8-dev"  # ruamel.yaml doesn't support 3.8 yet
+    - python: "3.8"
     - python: "3.7"
       script: RELEASE_SKIP=head ${TRAVIS_BUILD_DIR}/release-test.sh
 script: tox

README.rst

@@ -75,7 +75,7 @@ intended to be feature complete and provide comprehensive validation of CWL
 files as well as provide other tools related to working with CWL.
 
 This is written and tested for
-`Python <https://www.python.org/>`_ ``2.7 and 3.x {x = 5, 6, 7}``
+`Python <https://www.python.org/>`_ ``2.7 and 3.x {x = 5, 6, 7, 8}``
 
 The reference implementation consists of two packages.  The ``cwltool`` package
 is the primary Python module containing the reference implementation in the

requirements.txt

@@ -1,5 +1,5 @@
 requests>=2.4.3
-ruamel.yaml>=0.12.4,<=0.15.97
+ruamel.yaml>=0.12.4,<=0.16
 rdflib>=4.2.2,<4.3
 shellescape>=3.4.1,<3.5
 schema-salad>=4.5,<5

setup.py

@@ -62,7 +62,7 @@
           'setuptools',
           'requests >= 2.6.1',  # >= 2.6.1 to workaround
           # https://github.com/ionrock/cachecontrol/issues/137
-          'ruamel.yaml >= 0.12.4, <= 0.15.97',
+          'ruamel.yaml >= 0.12.4, <= 0.16',
           'rdflib >= 4.2.2, < 4.3.0',
           'shellescape >= 3.4.1, < 3.5',
           'schema-salad >= 4.5, < 5',
@@ -115,6 +115,7 @@
           'Programming Language :: Python :: 3.5',
           'Programming Language :: Python :: 3.6',
           'Programming Language :: Python :: 3.7',
+          'Programming Language :: Python :: 3.8',
           'Topic :: Scientific/Engineering',
           'Topic :: Scientific/Engineering :: Bio-Informatics',
           'Topic :: Scientific/Engineering :: Astronomy',

tox.ini

@@ -17,7 +17,7 @@ python =
   3.5: py35
   3.6: py36
   3.7: py37
-  3.8-dev: py38
+  3.8: py38
 
 [testenv]
 description =