feat(isFloat) Fix , passing as float

[frederike-ramin]

Similar to #752: Only passing , as string will result in a positive outcome of isFloat. This simply catches the case similar to . and + etc.

Checklist

• [x] PR contains only changes related; no stray files, etc.
• [x] README updated (where applicable)
• [x] Tests written (where applicable)

[codecov[bot]]

Codecov Report

Merging #2020 (8db790f) into master (86a07ba) will not change coverage. The diff coverage is 100.00%.

@@            Coverage Diff            @@
##            master     #2020   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files          104       104           
  Lines         2203      2203           
  Branches       477       477           
=========================================
  Hits          2203      2203           

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

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[frederike-ramin]

@rubiin do I still need to do anything to have this PR merged?

[rubiin]

Waiting for further approvals from @profnandaa

[profnandaa]

merging in #2164