Update test matrix removing Python 3.4 and adding 3.6, 3.7, 3.8

Python 3.4 is now EOL.

Update to Xenial required for Python 3.7 and 3.8 on Travis.

Update flake8 to use Python 3.8 compatible pyflakes [1]. Allow the
latest matching pycodestyle to be automatically installed.

Use libsqlite3-mod-spatialite to save compile time.

[1] PyCQA/pyflakes#367

.travis.yml

@@ -1,13 +1,13 @@
 language: python
 
 sudo: true
-dist: trusty
+dist: xenial
 
 addons:
-  postgresql: 9.3
+  postgresql: 9.6
   apt:
     packages:
-      - postgresql-9.3-postgis-2.3
+      - postgresql-9.6-postgis-2.4
       - python2.7-dev
       - python3-dev
       - autotools-dev
@@ -17,6 +17,7 @@ addons:
       - libproj-dev
       - libreadline-dev
       - libsqlite3-dev
+      - libsqlite3-mod-spatialite
       - libxml2-dev
       - zlib1g-dev
 
@@ -27,33 +28,28 @@ notifications:
 services:
   - postgresql
 
-cache:
-  directories:
-    - libspatialite-4.3.0a
-
 matrix:
   include:
     - python: 2.7
       env:
       - TOX_ENV=py27sqla11
-    - python: 3.4
-      env:
-      - TOX_ENV=py34sqla11
     - python: 3.5
       env:
       - TOX_ENV=py35sqla11
+    - python: 3.6
+      env:
+      - TOX_ENV=py36sqla11
+    - python: 3.7
+      env:
+      - TOX_ENV=py37sqla11
+    - python: 3.8
+      env:
+      - TOX_ENV=py38sqla11
     - python: pypy
       env:
       - TOX_ENV=pypysqla11
 
-env:
-  global:
-    - SPATIALITE_LIBRARY_PATH="/usr/local/lib/mod_spatialite.so"
-
 install:
-  # Install Spatialite
-  - ./install-spatialite.sh
-
   # Install tox
   - pip install tox
 

requirements.txt

@@ -2,8 +2,7 @@
 -e .
 
 # Additional requirements for running the testsuite and development
-pycodestyle==2.2.0
-flake8==3.2.0
+flake8==3.7.9
 pytest==3.7.4
 pytest-cov==2.5.1
 

tox.ini

@@ -1,8 +1,7 @@
 [tox]
-envlist=py27sqla11, py34sqla11, py35sqla11, pypysqla11
+envlist=py27sqla11, py35sqla11, py36sqla11, py37sqla11, py38sqla11, pypysqla11
 
 [testenv]
-passenv=SPATIALITE_LIBRARY_PATH
 commands=
     py.test \
         {posargs}
@@ -15,23 +14,37 @@ deps=
     pysqlite
     -rrequirements.txt
 
-[testenv:py34sqla11]
-basepython=python3.4
+[testenv:py35sqla11]
+basepython=python3.5
 deps=
     SQLAlchemy==1.1.2
     psycopg2
     -rrequirements.txt
 
-[testenv:py35sqla11]
-basepython=python3.5
+[testenv:py36sqla11]
+basepython=python3.6
 deps=
     SQLAlchemy==1.1.2
     psycopg2
     -rrequirements.txt
 
-[testenv:pypysqla11]
-basepython=pypy
+[testenv:py37sqla11]
+basepython=python3.7
 deps=
     SQLAlchemy==1.1.2
+    psycopg2
+    -rrequirements.txt
+
+[testenv:py38sqla11]
+basepython=python3.8
+deps=
+    SQLAlchemy==1.1.2
+    psycopg2
+    -rrequirements.txt
+
+[testenv:pypysqla11]
+basepython=pypy3
+deps=
+    SQLAlchemy==1.3.15
     psycopg2cffi
     -rrequirements.txt