Package.json: replaces prepublish script to prepare

[sgobotta]

Description

Please include a summary of the change and which issue is fixed. Please also include relevant motivation and context. List any dependencies that are required for this change.

This PR provides:

• Npm script update: prepublish -> prepare

Closes #28
Closes #185

Type of change

Please delete options that are not relevant.

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

Checklist:

The following options in bold are required for a PR approval. Please check the boxes only if necessary, it help us minimizing the reviewing process.

• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes

[codecov-io]

Codecov Report

Merging #208 into develop will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff            @@
##           develop     #208   +/-   ##
========================================
  Coverage    42.24%   42.24%           
========================================
  Files           94       94           
  Lines          748      748           
  Branches        30       30           
========================================
  Hits           316      316           
  Misses         429      429           
  Partials         3        3

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