prepare for release

[ghost]

Builds will currently fail until Modoboa 1.10.0 is tagged, this build shows the other changes don't break anything.

• refactor setup.py

  • use setuptools_scm to generate version number, normal releases will use the tagged version (ie 1.9.1), versions installed from source will append the git commit number to the version number (ie 1.9.1.dev61+g4584c93)

  • use io.open() to read text files to correctly handle utf-8 characters

  • use pip to parse requirements.txt

  • update classifiers to specify python and django versions supported

  • wheel distributions can now be built using python setup.py bdist_wheel

• fix travis setup

  • target oldest currently supported database servers, travis currently defaults to PostgreSQL 9.2 which isn't supported anymore.

  • move database dependencies out of travis.yml into test_requirements.txt and pin to minimum versions recommended by django. See https://docs.djangoproject.com/en/1.11/ref/databases/

  • remove unnecessary database setup. See modoboa/modoboa#1340

  • create binary wheels when a tag is pushed

[codecov[bot]]

Codecov Report

Merging #30 into master will decrease coverage by 0.8%. The diff coverage is 71.42%.

@@            Coverage Diff             @@
##           master      #30      +/-   ##
==========================================
- Coverage   96.26%   95.45%   -0.81%     
==========================================
  Files          14       14              
  Lines         214      220       +6     
==========================================
+ Hits          206      210       +4     
- Misses          8       10       +2

Impacted Files	Coverage Δ
modoboa_imap_migration/__init__.py	75% <71.42%> (-25%)	:arrow_down:

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