Remove npm dep by removing `david`

[tomdye]

Type: feature

The following has been addressed in the PR:

• [ ] There is a related issue
• [ ] All code has been formatted with prettier as per the readme code style guidelines
• [ ] Unit or Functional tests are included in the PR

Description:

New version data is gathered from npm search rather than david.

Resolves #206

[codecov[bot]]

Codecov Report

Merging #208 into master will increase coverage by 0.38%. The diff coverage is 95.65%.

@@            Coverage Diff             @@
##           master     #208      +/-   ##
==========================================
+ Coverage   94.37%   94.75%   +0.38%     
==========================================
  Files          19       19              
  Lines         480      477       -3     
  Branches       65       63       -2     
==========================================
- Hits          453      452       -1     
+ Misses         15       13       -2     
  Partials       12       12

Impacted Files	Coverage Δ
src/detachedCheckForNewCommands.ts	0% <0%> (ø)	:arrow_up:
src/installableCommands.ts	90.32% <100%> (+0.15%)	:arrow_up:
src/commands/version.ts	98.36% <100%> (-0.06%)	:arrow_down:

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