Add testing and document support for Python 3.7

Python 3.7 was released on June 27, 2018.

.travis.yml

@@ -33,10 +33,12 @@ matrix:
     - python: pypy
       env:
         - TOXENV=pypy
-    - python: 3.7-dev
+    - python: 3.7
       env:
         - TOXENV=py37
         - WITH_GCOV=1
+      dist: xenial
+      sudo: true
     - python: 2.7
       env:
         - TOXENV=py2-nosasltls
@@ -51,9 +53,6 @@ matrix:
     - python: 3.6
       env: TOXENV=doc
   allow_failures:
-     - env:
-        - TOXENV=py37
-        - WITH_GCOV=1
      - env:
         - TOXENV=pypy
 

setup.py

@@ -94,6 +94,7 @@ class OpenLDAP2:
     'Programming Language :: Python :: 3.4',
     'Programming Language :: Python :: 3.5',
     'Programming Language :: Python :: 3.6',
+    'Programming Language :: Python :: 3.7',
     # Note: when updating Python versions, also change .travis.yml and tox.ini
 
     'Topic :: Database',

tox.ini

@@ -5,7 +5,7 @@
 
 [tox]
 # Note: when updating Python versions, also change setup.py and .travis.yml
-envlist = py27,py34,py35,py36,{py2,py3}-nosasltls,doc,py3-trace,coverage-report
+envlist = py27,py34,py35,py36,py37,{py2,py3}-nosasltls,doc,py3-trace,coverage-report
 minver = 1.8
 
 [testenv]
@@ -19,6 +19,7 @@ passenv = WITH_GCOV
 commands = {envpython} -bb -Werror \
     "-Wignore:the imp module is deprecated:DeprecationWarning" \
     "-Wignore:the imp module is deprecated:PendingDeprecationWarning" \
+    "-Wignore:Using or importing the ABCs from 'collections' instead of from 'collections.abc' is deprecated, and in 3.8 it will stop working:DeprecationWarning" \
     -m coverage run --parallel setup.py \
         clean --all \
         test