Completed support for PostgresSQL without JDBC

[Apoalex92]

Hello!
I have completed the support for PostgreSQL without using JDBC (just a basic configuration).
In my case, it solves the issue #50.

I have updated the settings part in which the appropriate database engine is selected.

For further works it would be great to add more details to the ColumnMetadata infos

[codecov]

Codecov Report

Merging #59 into master will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##            master       #59   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           13        13           
  Lines          620       629    +9     
  Branches        75        77    +2     
=========================================
+ Hits           620       629    +9     

Impacted Files	Coverage Δ
local_data_api/models.py	100.00% <100.00%> (ø)
local_data_api/resources/postgres.py	100.00% <100.00%> (ø)
local_data_api/settings.py	100.00% <100.00%> (ø)

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[koxudaxi]

@Apoalex92
Thank you for creating your PR.
Looks Good!!
Would you please add a unittest for covering your code?
I want to make coverage 100%.

[Apoalex92]

Sure! Sorry for not doing it before :)

[Apoalex92]

@koxudaxi It's done!

[koxudaxi]

@Apoalex92
Looks good!
I have merged and released a new version as 0.4.10.

Thank you very much.