Fix idle walking.

.travis.yml

@@ -7,13 +7,6 @@ matrix:
       python: '3.6'
       compiler: clang
 
-    - os: osx
-      language: generic
-      env: TRAVIS_PYTHON_VERSION="3.7"
-      osx_image: xcode11.2
-      python: '3.7'
-      compiler: clang
-
     - os: linux
       language: python
       python: 'pypy3'

setup.py

@@ -120,9 +120,9 @@ setup(
     include_package_data=True,
     platforms=["Linux", "Mac OS-X", "Unix"],
     classifiers=[
-        'Development Status :: 3 - Alpha',
+        'Development Status :: 5 - Production/Stable',
         'License :: OSI Approved :: GNU General Public License v3 or later (GPLv3+)',
-        'Intended Audience :: Developers',
+        'Intended Audience :: Science/Research',
         'Programming Language :: Python :: 3 :: Only',
         'Programming Language :: Python :: 3.5',
         'Programming Language :: Python :: 3.6',