add supports PostgreSQL data type and Python 3.7

[shinichi-takii]

Changes

• Add supports for Python 3.7.
  • Pass Python 3.7 test.
• Add supports PostgreSQL data type.
  • CHARACTER VARYING
  • JSON
  • Array type
• Fix parse DEFAULT value.
  • Add decimal point to DEFAULT parse character.

Applicable Issues

• fix #24 - Not parsing all fields from PostgreSQL DDL
• fix #25 - Does not support PostgreSQL array and json
• fix #26 - Supports for Python 3.7

[codecov[bot]]

Codecov Report

Merging #27 into master will not change coverage. The diff coverage is 100%.

@@          Coverage Diff          @@
##           master    #27   +/-   ##
=====================================
  Coverage     100%   100%           
=====================================
  Files           2      2           
  Lines         227    266   +39     
=====================================
+ Hits          227    266   +39

Impacted Files	Coverage Δ
ddlparse/ddlparse.py	100% <100%> (ø)	:arrow_up:
ddlparse/__init__.py	100% <100%> (ø)	:arrow_up:

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[coveralls]

Coverage remained the same at 100.0% when pulling bcecb85c6d0fa7dcff317e3bec02cb70df9be610 on feature/fix-postgres-data-type into c88cc8f3d1931ad7245183cb588fd0061fe7e183 on master.