Try to add support for Python 3.8

.travis.yml

@@ -3,6 +3,7 @@ python:
   - "3.5"
   - "3.6"
   - "3.7"
+  - "3.8"
   - "pypy3"
 before_install:
   - pip install poetry

src/gwf/utils.py

@@ -50,13 +50,13 @@ def __init__(self, msg, logger=None):
         self.logger = logger or logging.getLogger(__name__)
 
     def __enter__(self):
-        self.start = time.clock()
+        self.start = time.perf_counter()
         return self
 
     def __exit__(self, *args):
-        self.end = time.clock()
+        self.end = time.perf_counter()
         self.duration = self.end - self.start
-        self.logger.debug(self.msg, self.duration * 1000)
+        self.logger.debug(self.msg, self.duration)
 
 
 def ensure_dir(path):

tests/plugins/test_touch.py

@@ -2,6 +2,8 @@
 import os.path
 import multiprocessing
 
+multiprocessing.set_start_method("fork")
+
 import pytest
 
 from gwf.cli import main