[WIP][ADD] coopiteasy subscription support followup

[robinkeunen]

Description

Odoo task (if applicable)

Checklist before approval

• Tests are present (or not needed).
• Credits/copyright have been changed correctly.
• Change log snippet is present.
• (If a new module) Moving this to OCA has been considered.

[codecov-commenter]

Codecov Report

Merging #108 (969968b) into 12.0 (3f4dca5) will increase coverage by 0.41%.
The diff coverage is 100.00%.

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@@            Coverage Diff             @@
##             12.0     #108      +/-   ##
==========================================
+ Coverage   78.70%   79.12%   +0.41%     
==========================================
  Files          80       83       +3     
  Lines         803      819      +16     
  Branches      138      141       +3     
==========================================
+ Hits          632      648      +16     
  Misses        152      152              
  Partials       19       19              

Files Changed	Coverage Δ
coopiteasy_subscription/models/__init__.py	100.00% <100.00%> (ø)
coopiteasy_subscription/models/contract_line.py	100.00% <100.00%> (ø)
coopiteasy_subscription/models/product_template.py	100.00% <100.00%> (ø)

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