Support Python 3.5 to 3.7 (#157)

* Update requirements to compile one per Python version.
* Update tox setup to test with all supported Python versions.
* Update Travis config to use a matrix, with `tox-travis`.
* Update README to say "Python 3.5-3.7 supported."
* Update `classifiers` and `python_requires` in `setup.py`
* Add note in `HISTORY.rst` "Update Python support to 3.5-3.7, as 3.4 has reached its end of life."

.travis.yml

@@ -1,15 +1,20 @@
-sudo: required
 dist: xenial
+sudo: required
 
 notifications:
   email: false
 
 language: python
-python: '3.6'
 cache: pip
 
+matrix:
+  include:
+  - python: 3.5
+  - python: 3.6
+  - python: 3.7
+
 install:
-  - sudo apt-get install ghostscript
-  - pip install tox
-script:
-  - tox
+- sudo apt-get install ghostscript
+- pip install tox-travis
+
+script: tox

HISTORY.rst

@@ -6,6 +6,8 @@ History
 
 .. Insert new release notes below this line
 
+* Update Python support to 3.5-3.7, as 3.4 has reached its end of life.
+
 3.0.0 (2019-05-08)
 ------------------
 

README.rst

@@ -22,7 +22,7 @@ Install from **pip**:
 
     pip install treepoem
 
-Python 3.4+ supported.
+Python 3.5-3.7 supported.
 
 You'll also need Ghostscript installed. On Ubuntu/Debian this can be installed
 with:

requirements-compile.sh

@@ -0,0 +1,6 @@
+#!/bin/sh
+set -ex
+export CUSTOM_COMPILE_COMMAND="./requirements-compile.sh"
+python3.5 -m piptools compile "$@" -o requirements/py35.txt
+python3.6 -m piptools compile "$@" -o requirements/py36.txt
+python3.7 -m piptools compile "$@" -o requirements/py37.txt

requirements/py35.txt

@@ -0,0 +1,26 @@
+#
+# This file is autogenerated by pip-compile
+# To update, run:
+#
+#    ./requirements-compile.sh
+#
+atomicwrites==1.3.0       # via pytest
+attrs==19.1.0             # via pytest
+docutils==0.14
+entrypoints==0.3          # via flake8
+flake8-commas==2.0.0
+flake8==3.7.7
+isort==4.3.19
+mccabe==0.6.1             # via flake8
+more-itertools==7.0.0     # via pytest
+multilint==3.0.0
+pathlib2==2.3.3           # via pytest
+pillow==6.0.0
+pluggy==0.11.0            # via pytest
+py==1.8.0                 # via pytest
+pycodestyle==2.5.0        # via flake8
+pyflakes==2.1.1           # via flake8
+pygments==2.4.0
+pytest==4.5.0
+six==1.12.0               # via pathlib2, pytest
+wcwidth==0.1.7            # via pytest

requirements.txt → requirements/py36.txt

@@ -2,23 +2,24 @@
 # This file is autogenerated by pip-compile
 # To update, run:
 #
-#    __main__.py compile -r -U
+#    ./requirements-compile.sh
 #
 atomicwrites==1.3.0       # via pytest
 attrs==19.1.0             # via pytest
 docutils==0.14
 entrypoints==0.3          # via flake8
 flake8-commas==2.0.0
 flake8==3.7.7
-isort==4.3.18
+isort==4.3.19
 mccabe==0.6.1             # via flake8
 more-itertools==7.0.0     # via pytest
-multilint==2.4.0
+multilint==3.0.0
 pillow==6.0.0
 pluggy==0.11.0            # via pytest
 py==1.8.0                 # via pytest
 pycodestyle==2.5.0        # via flake8
 pyflakes==2.1.1           # via flake8
 pygments==2.4.0
-pytest==4.4.1
-six==1.12.0               # via multilint, pytest
+pytest==4.5.0
+six==1.12.0               # via pytest
+wcwidth==0.1.7            # via pytest

requirements/py37.txt

@@ -0,0 +1,25 @@
+#
+# This file is autogenerated by pip-compile
+# To update, run:
+#
+#    ./requirements-compile.sh
+#
+atomicwrites==1.3.0       # via pytest
+attrs==19.1.0             # via pytest
+docutils==0.14
+entrypoints==0.3          # via flake8
+flake8-commas==2.0.0
+flake8==3.7.7
+isort==4.3.19
+mccabe==0.6.1             # via flake8
+more-itertools==7.0.0     # via pytest
+multilint==3.0.0
+pillow==6.0.0
+pluggy==0.11.0            # via pytest
+py==1.8.0                 # via pytest
+pycodestyle==2.5.0        # via flake8
+pyflakes==2.1.1           # via flake8
+pygments==2.4.0
+pytest==4.5.0
+six==1.12.0               # via pytest
+wcwidth==0.1.7            # via pytest

setup.py

@@ -38,7 +38,7 @@ def get_version(filename):
     install_requires=[
         'Pillow',
     ],
-    python_requires='>=3.4',
+    python_requires='>=3.5',
     license="MIT",
     zip_safe=False,
     keywords='barcode bwipp postscript ghostscript qr qrcode aztec azteccode pdf417 interleaved2of5 i25 code128 code39',
@@ -48,9 +48,8 @@ def get_version(filename):
         'License :: OSI Approved :: MIT License',
         'Natural Language :: English',
         'Programming Language :: Python :: 3',
-        'Programming Language :: Python :: 3.3',
-        'Programming Language :: Python :: 3.4',
         'Programming Language :: Python :: 3.5',
         'Programming Language :: Python :: 3.6',
+        'Programming Language :: Python :: 3.7',
     ],
 )

tox.ini

@@ -1,15 +1,22 @@
 [tox]
 envlist =
-    py3,
-    py3-codestyle
+    py{35,36,37},
+    py37-codestyle
 
 [testenv]
 install_command = pip install --no-deps {opts} {packages}
-deps =
-    -rrequirements.txt
 commands = pytest {posargs}
 
-[testenv:py3-codestyle]
-changedir = {toxinidir}
+[testenv:py35]
+deps = -rrequirements/py35.txt
+
+[testenv:py36]
+deps = -rrequirements/py36.txt
+
+[testenv:py37]
+deps = -rrequirements/py37.txt
+
+[testenv:py37-codestyle]
+deps = -rrequirements/py37.txt
 skip_install = true
 commands = multilint