generic grep: support "modifier.name" matching - fixes #1

[tintinweb]

# solgrep test.sol  --find="modifier.name"


🧠 SolGrep v0.0.6 ready!

  Enabled Modules:
    ✔️ GenericGrep          modifier.name

[████████████████████████████████████████] 100% | 🕙 ETA: 0s | 1/1 | 🌲 0 | 🔥 0 | 🗂️  test.sol

   ────────────────────────────
{
  'test.sol': [
    {
      rule: 'GenericGrep',
      tag: 'match-modifier: ReEntrancyGuard.noReentrant',
      info: 'noReentrant',
      loc: [Array]
    }
  ]
}

⚠️ when using multi-options (--find, --rule) make sure to use this format:

⇒  solgrep <folder|...> [options]

or

⇒  solgrep [options] -- <folder|...> 

or else additional options might be interpreted as additional --find options!