Restricted negative values/sign in weight and height user input

[rakheesingh]

This PR address is my proposal of bug #44 Negative weight and height should not allow in user input.
I have added a function called filter input to validate user input on the event of keyDown.

const filterInput = (e, restrictKeyList) => {
		let isValidInput = restrictKeyList.some((key) => e.key === key);
		if (isValidInput) e.preventDefault();
	}

This small change will restrict users to enter any sign in input and solve issue #44.

[codecov]

Codecov Report

Merging #48 (43214fe) into master (7e4714d) will decrease coverage by 0.99%.
The diff coverage is 42.85%.

@@            Coverage Diff             @@
##           master      #48      +/-   ##
==========================================
- Coverage   53.62%   52.63%   -1.00%     
==========================================
  Files           5        5              
  Lines          69       76       +7     
  Branches        5        6       +1     
==========================================
+ Hits           37       40       +3     
- Misses         29       33       +4     
  Partials        3        3              

Impacted Files	Coverage Δ
src/components/BmiForm/BmiForm.jsx	72.72% <42.85%> (-13.94%)	⬇️

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