feat: Tiny change to plugin.js to reduce the size of lodash on build

[roelbeerens]

I've changed the way the lodash functions are loaded to only include these 2 functions instead of the full lodash library.
This should reduce the build/vendor size of built nuxt applications when using this module.

Types of changes

• Bug fix (a non-breaking change which fixes an issue)
• New feature (a non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Description

This reduces the overall vendor size when building your application.

Checklist:

• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have added tests to cover my changes (if not applicable, please state why)

[codecov]

Codecov Report

Merging #45 into master will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##            master       #45   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            1         1           
  Lines           13        13           
  Branches         3         3           
=========================================
  Hits            13        13           

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