feat: add option to specify config file via package.json

[leonardoanalista]

now users can specify any location and name for the configuration file. This is done in your
package.json. Please refer to latest readme.md file for further details

ISSUES CLOSED: #26

[codecov-io]

Current coverage is 100.00%

Merging #28 into master will not affect coverage as of 3186263

@@            master     #28   diff @@
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  Files            2       2       
  Stmts          236     242     +6
  Branches         0       0       
  Methods          0       0       
======================================
+ Hit            236     242     +6
  Partial          0       0       
  Missed           0       0       

Review entire Coverage Diff as of 3186263

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