Make RSpec/ExampleWording handle "it will" future tense

[jdufresne]

Fixes #1751

Replace this text with a summary of the changes in your PR. The more detailed you are, the better.

---

Before submitting the PR make sure the following are checked:

• Feature branch is up-to-date with master (if not - rebase it).
• Squashed related commits together.
• Added tests.
• Updated documentation.
• Added an entry to the CHANGELOG.md if the new code introduces user-observable changes.
• The build (bundle exec rake) passes (be sure to run this locally, since it may produce updated documentation that you will need to commit).

If you have modified an existing cop's configuration options:

• Set VersionChanged: "<<next>>" in config/default.yml.

[pirj]

Thank you!

[jdufresne]

What is the project's preferred way to satisfy these offenses in the code? To me, breaking these small functions into smaller functions doesn't feel like a win.

lib/rubocop/cop/rspec/example_wording.rb:70:9: C: Metrics/MethodLength: Method has too many lines. [12/10]
        def on_block(node) # rubocop:disable InternalAffairs/NumblockHandler ...
        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
lib/rubocop/rspec/wording.rb:20:7: C: Metrics/MethodLength: Method has too many lines. [12/10]
      def rewrite ...
      ^^^^^^^^^^^

[ydah]

What is the project's preferred way to satisfy these offenses in the code? To me, breaking these small functions into smaller functions doesn't feel like a win.

lib/rubocop/cop/rspec/example_wording.rb:70:9: C: Metrics/MethodLength: Method has too many lines. [12/10]
        def on_block(node) # rubocop:disable InternalAffairs/NumblockHandler ...
        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
lib/rubocop/rspec/wording.rb:20:7: C: Metrics/MethodLength: Method has too many lines. [12/10]
      def rewrite ...
      ^^^^^^^^^^^

You may want to silence the offense with a disable comment.　
refs: https://docs.rubocop.org/rubocop/configuration.html#disabling-cops-within-source-code

[jdufresne]

@ydah Thanks! I took this approach in the latest revision.

[ydah]

Looks good! Thank you.