136 add regex filter

[epi052]

closes #136

Branching checklist

• There is an issue associated with your PR (bug, feature, etc.. if not, create one)
• Your PR description references the associated issue (i.e. fixes [FEATURE REQUEST] Dynamically tuning concurrency/connection limit or bailing after n connection failures #123)
• Code is in its own branch
• Branch name is related to the PR contents
• PR targets master

Static analysis checks

• All rust files are formatted using cargo fmt
• All clippy checks pass when running cargo clippy --all-targets --all-features -- -D warnings -A clippy::deref_addrof
• All existing tests pass

Documentation

• New code is documented using doc comments
• Documentation about your PR is included in the README, as needed

Additional Tests

• New code is unit tested
• New code is integration tested, as needed
• New tests pass

[epi052]

• config.rs
  • add new value to Configuration struct
  • update Configuration::default with new value
  • update Configuration docstring with the new value/default (if appropriate)
  • update Configuration::new so that the new value is stored in config
  • update Configuration::merge_config with new value
  • update Configuration::tests::setup_config_test with new value
  • add unit test to check config parsing
• ferox-config.toml.example
  • add new value to example config
• banner.rs
  • add new check for the value in banner::initialize
  • create new entry to be written in the banner for the new value
    • add new emoji to the entry (should be somewhat related to the value name)
  • add new integration test (tests/test_banner) or update existing so that it's displayed under test
• Cargo.toml
  • bump version: add 1 to minor release and set patch release to 0
• README.md
  • update default config section (if needed)
  • update example config file section
  • update help output section
  • add an example with a heading that conforms to others (new in v1.4.0...)
    • add an entry for the example in the table of contents
• parser.rs
  • add the option to the parser
• wherever.rs
  • implement the new feature

[codecov]

Codecov Report

Merging #140 (31891b5) into master (4c39944) will increase coverage by 0.31%.
The diff coverage is 94.89%.

@@            Coverage Diff             @@
##           master     #140      +/-   ##
==========================================
+ Coverage   93.71%   94.02%   +0.31%     
==========================================
  Files          13       13              
  Lines        2179     2260      +81     
==========================================
+ Hits         2042     2125      +83     
+ Misses        137      135       -2     

Impacted Files	Coverage Δ
src/scanner.rs	91.91% <92.59%> (-0.15%)	⬇️
src/filters.rs	98.19% <94.44%> (+3.54%)	⬆️
src/banner.rs	100.00% <100.00%> (+0.29%)	⬆️
src/config.rs	96.48% <100.00%> (+0.07%)	⬆️
src/main.rs	90.25% <100.00%> (-0.43%)	⬇️
src/parser.rs	100.00% <100.00%> (ø)

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