Add additionalData option

[cap-Bernardito]

This PR contains a:

• bugfix
• new feature
• code refactor
• test update
• typo fix
• metadata update

Motivation / Use-Case

Combines the appendData and prependData options into one additionalData option

Breaking Changes

Removed the appendData and prependData options in favor additionalData option

Additional Info

No

[codecov]

Codecov Report

Merging #374 into master will decrease coverage by 0.10%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #374      +/-   ##
==========================================
- Coverage   97.27%   97.16%   -0.11%     
==========================================
  Files           4        4              
  Lines         110      106       -4     
  Branches       28       25       -3     
==========================================
- Hits          107      103       -4     
  Misses          3        3              

Impacted Files	Coverage Δ
src/index.js	100.00% <100.00%> (ø)

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