WIP - Ignore and ignore-postfix

[RebeccaStevens]

Fixes #114 #101

[codecov]

Codecov Report

Merging #128 into master will not change coverage.
The diff coverage is 100%.

@@          Coverage Diff          @@
##           master   #128   +/-   ##
=====================================
  Coverage     100%   100%           
=====================================
  Files          16     16           
  Lines         379    376    -3     
  Branches      165    164    -1     
=====================================
- Hits          379    376    -3

Impacted Files	Coverage Δ
src/noLetRule.ts	100% <ø> (ø)	⬆️
src/readonlyKeywordRule.ts	100% <100%> (ø)	⬆️
src/noObjectMutationRule.ts	100% <100%> (ø)	⬆️
src/readonlyArrayRule.ts	100% <100%> (ø)	⬆️
src/noExpressionStatementRule.ts	100% <100%> (ø)	⬆️
src/noArrayMutationRule.ts	100% <100%> (ø)	⬆️

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[RebeccaStevens]

Possibly a breaking change at the moment as ignore-prefix has been rewritten. More testing is probably needed.

[RebeccaStevens]

Closing in favor of #137