Work around pip resolver gotcha with latest Sphinx. Bump version to 3…

….1.2. Fix #172.

README.rst

@@ -327,7 +327,7 @@ A good example using most of sphinx-js's functionality is the Fathom documentati
 
 Then put the version of sphinx-js you want in ``docs/requirements.txt``. For example... ::
 
-    sphinx-js==3.1.1
+    sphinx-js==3.1.2
 
 Or, if you prefer, the Fathom repo carries a `Travis CI configuration <https://github.com/mozilla/fathom/blob/92304b8ad4768e90c167c3d93f9865771f5a6d80/.travis.yml#L41>`_ and a `deployment script <https://github.com/mozilla/fathom/blob/92304b8ad4768e90c167c3d93f9865771f5a6d80/tooling/travis-deploy-docs>`_ for building docs with sphinx-js and publishing them to GitHub Pages. Feel free to borrow them.
 
@@ -348,6 +348,9 @@ Run the tests using tox, which will also install JSDoc and TypeDoc at pinned ver
 Version History
 ===============
 
+3.1.2
+  * Remove our declared dependency on ``docutils`` to work around the way pip's greedy dependency resolver reacts to the latest version of Sphinx. pip fails when pip-installing sphinx-js because pip sees our "any version of docutils" declaration first (which resolves greedily to the latest version, 0.17) but later encounters Sphinx's apparently new ``<0.17`` constraint and gives up. We can revert this when pip's ``--use-feature=2020-resolver`` becomes the default.
+
 3.1.1
   * Rewrite large parts of the suffix tree that powers path lookup. This fixes several crashers.
 

requirements_dev.txt

@@ -1,6 +1,6 @@
-pytest==5.4.3
-recommonmark==0.6.0
+pytest==6.2.3
+recommonmark==0.7.1
 # Sphinx's plain-text renderer changes behavior slightly
 # with regard to how it emits class names and em dashes from
 # time to time:
-Sphinx==3.1.1
+Sphinx==3.5.4

setup.py

@@ -4,7 +4,7 @@
 
 setup(
     name='sphinx-js',
-    version='3.1.1',
+    version='3.1.2',
     description='Support for using Sphinx on JSDoc-documented JS code',
     long_description=open('README.rst', 'r', encoding='utf8').read(),
     long_description_content_type="text/x-rst",
@@ -14,7 +14,7 @@
     packages=find_packages(exclude=['ez_setup']),
     url='https://github.com/mozilla/sphinx-js',
     include_package_data=True,
-    install_requires=['docutils', 'Jinja2>2.0,<3.0', 'parsimonious>=0.7.0,<0.8.0', 'Sphinx>=3.0.0'],
+    install_requires=['Jinja2>2.0,<3.0', 'parsimonious>=0.7.0,<0.8.0', 'Sphinx>=3.0.0'],
     python_requires='>=3.7',
     classifiers=[
         'Intended Audience :: Developers',