fix(validators): host validator enforced with URLs only

[lirantal]

Description

Hosts validators were showing regression too incase the URL was an invalid one.

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Related Issue

Comment in #60 (comment)

[codecov-io]

Codecov Report

Merging #61 into master will not change coverage.
The diff coverage is 100%.

@@           Coverage Diff           @@
##           master      #61   +/-   ##
=======================================
  Coverage   95.08%   95.08%           
=======================================
  Files          11       11           
  Lines         183      183           
  Branches       29       29           
=======================================
  Hits          174      174           
  Misses          8        8           
  Partials        1        1

Impacted Files	Coverage Δ
...s/lockfile-lint-api/src/validators/ValidateHost.js	100% <100%> (ø)	⬆️

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