Delete core-js library from dependecies

[oleksiikhr]

Build change:

Before

File                               Size                                                                       Gzipped

dist/vue-stripe-menu.umd.min.js    31.89 KiB                                                                  10.74 KiB
dist/vue-stripe-menu.umd.js        90.99 KiB                                                                  22.57 KiB
dist/vue-stripe-menu.common.js     90.50 KiB                                                                  22.41 KiB
dist/vue-stripe-menu.css           6.79 KiB                                                                   1.44 KiB

After

File                               Size                                                                       Gzipped

dist/vue-stripe-menu.umd.min.js    12.84 KiB                                                                  4.11 KiB
dist/vue-stripe-menu.umd.js        32.65 KiB                                                                  8.53 KiB
dist/vue-stripe-menu.common.js     32.17 KiB                                                                  8.39 KiB
dist/vue-stripe-menu.css           6.79 KiB                                                                   1.44 KiB

[codecov-commenter]

Codecov Report

Merging #191 into master will increase coverage by 0.38%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #191      +/-   ##
==========================================
+ Coverage   88.72%   89.10%   +0.38%     
==========================================
  Files           2        2              
  Lines         204      202       -2     
  Branches       30       30              
==========================================
- Hits          181      180       -1     
+ Misses         23       22       -1     

Impacted Files	Coverage Δ
src/components/Menu.vue	89.77% <0.00%> (+0.44%)	⬆️

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