Apply "right" positioning for SuggestionsOverlay

[lucioperca]

Fixes #425 by correctly positioning the suggestions overlay at the right side of the input when appropriate.

• Adds right as a property for SuggestionsOverlay.
• Includes right when destructuring and checking for changes in suggestionsPosition in the MentionsInput component. Passes this value into SuggestionsOverlay.

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[codecov-commenter]

Codecov Report

Merging #426 into master will not change coverage. The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master     #426   +/-   ##
=======================================
  Coverage   78.87%   78.87%           
=======================================
  Files          31       31           
  Lines         691      691           
  Branches      107      107           
=======================================
  Hits          545      545           
  Misses        145      145           
  Partials        1        1           

Impacted Files	Coverage Δ
src/SuggestionsOverlay.js	66.00% <ø> (ø)
src/MentionsInput.js	68.75% <100.00%> (ø)

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[lucioperca]

Same issue is fixed by: https://github.com/signavio/react-mentions/pull/661