Fix WARNINGs when building fastlane gemspec

[lacostej]

Annoying warnings when building the gemspec. Clutters the logs and the mind.

$ gem build fastlane.gemspec
WARNING:  description and summary are identical
WARNING:  open-ended dependency on colored (>= 0) is not recommended
  use a bounded requirement, such as '~> x.y'
WARNING:  open-ended dependency on optparse (>= 0.1.1) is not recommended
  if optparse is semantically versioned, use:
    add_runtime_dependency 'optparse', '~> 0.1', '>= 0.1.1'
WARNING:  open-ended dependency on xcpretty-travis-formatter (>= 0.0.3) is not recommended
  if xcpretty-travis-formatter is semantically versioned, use:
    add_runtime_dependency 'xcpretty-travis-formatter', '~> 0.0', '>= 0.0.3'
WARNING:  See https://guides.rubygems.org/specification-reference/ for help
  Successfully built RubyGem
  Name: fastlane
  Version: 2.219.0
  File: fastlane-2.219.0.gem

Checklist

• I've run bundle exec rspec from the root directory to see all new and existing tests pass
• I've followed the fastlane code style and run bundle exec rubocop -a to ensure the code style is valid
• I see several green ci/circleci builds in the "All checks have passed" section of my PR (connect CircleCI to GitHub if not)
• I've read the Contribution Guidelines
• I've updated the documentation if necessary.
• I've added or updated relevant unit tests.

Motivation and Context

Description

• tightened some dependencies
• added a gem summary

Testing Steps

[lacostej]

this version was released in 2010. So pretty safe even though in theory bumping could still be a problem?

[rogerluan]

I think this is fine

[rogerluan]

💯

[rogerluan]

I think this is fine