Update README.md
Merge pull request #1471 from jeffreyjackson/patch-1

Update README.md
RubyGems over TLS
Failing test for ElseAlignment bug
[Fix #1470] Handle elsif+else in ElseAlignment

Statements with if+elsif+else were not handled properly
before.
Merge pull request #1472 from jonas054/1470_else_alignment

Handle elsif+else in ElseAlignment
New cop Style/EmptyElse

Checks for empty `else`-clauses, i.e. clauses containing nothing but comments
and/or an explicit ending `nil`.
Correct some spelling errors
Merge pull request #1476 from jonas054/fix_spelling

Correct some spelling errors
Merge pull request #1444 from Koronen/vk-else-nil

New cop Style/ElseNil
Support style-guide only usage

Many cops that have been implemented and enabled by default have no
correlation to a style-guide rule: `Metrics/ClassLength`,
`Metrics/AbcSize`, `Metrics/PerceivedComplexity` just to name a few. In
cases where these cops find violations, there's little recourse as the
rules cannot be traced back to a meaningful discussion or consensus.

The `--only-guide-cops` and `AllCops/StyleGuideCopsOnly` options give
users an easy method of invoking RuboCop in a way that's more congruent
with the rules of the style guide.

Working around `GuardClause` violation in `Runner#filter_cop_classes`.