Update rubocop dependency to >= 0.23
Update docs badge in README

Update the URL of the docs badge to include it from inch-ci.org instead of inch-pages.github.io (the former being the successor of the Inch Pages project).
Merge pull request #574 from rrrene/patch-2

Update docs badge in README
Fix typo in docs
Merge pull request #576 from rrrene/patch-3

Fix typo in docs
Move documentation of possibly_sensitive to update methods [ci skip]

Closes #577.
Alias URL_PREFIX to ENDPOINT for backward compatibility
Add streaming example [ci skip]
Prepare for version 5.10.0 release
Add iso_language_code attr_reader to Twitter::Metadata
Return a Twitter::NullObject for empty attributes
Ensure predicate methods return false for Twitter::NullObject
Replace Faraday with the HTTP gem
JSON keys are parsed into strings, not symbols