Update pry requirement from = 0.9.12.6 to = 0.12.2

[dependabot-preview]

Updates the requirements on pry to permit the latest version.

Changelog

Sourced from pry's changelog.

[v0.12.2][v0.12.2] (November 12, 2018)

Bug fixes

• Restore removed deprecations, which were removed by accident due to a bad
  rebase.

[v0.12.1][v0.12.1] (November 12, 2018)

Bug fixes

• Stopped creating a new hash each time Pry::Prompt#[] is invoked
  (#1855)
• Fixed less pager not working when it's available
  (#1861)

[v0.12.0][v0.12.0] (November 5, 2018)

Major changes

• Dropped support for Rubinius (#1785)

Features

• Added a new command, clear-screen, that clears the content of the screen Pry
  is running in regardless of platform (Windows or UNIX-like)
  (#1723)

• Added a new command, gem-stat, that prints gem statistics such as gem
  dependencies and downloads (#1707)

• Added support for nested exceptions for the wtf command
  (#1791)

• Added support for dynamic prompt names
  (#1833)

  # pryrc
  Pry.config.prompt_name = Pry.lazy { rand(100) }
  
  # Session
  [1] 80(main)>
  [2] 87(main)>
  [3] 30(main)>

• Added support for XDG Base Directory Specification
  (#1609,
  #1844,
  (#1848))

• Removed the simple-prompt. Use change-prompt simple instead. The
  list-prompt command was removed and embedded as change-prompt --list
  (#1849)

... (truncated)

Commits

• 14a0273 Release v0.12.2
• 2894b02 Merge pull request #1880 from pry/release-0-12-1
• c9e7489 Release v0.12.1
• bdd39b0 pager.rb: fix Helpers constant invocation
• 8817c3a do not create a new hash each time a prompt is accessed via Pry::Prompt[]
• 4b0b49b Release v0.12.0
• 2113ae2 gemspec: change method_source back to '~> 0.9.0'
• 6ef68d7 Merge pull request #1780 from pry/changelog-next-version
• f95b7a7 CHANGELOG: prepare for release v0.12.0
• 5bf2a5b rubocop: temporarily ignore certain Naming/MethodName offences
• Additional commits viewable in compare view

Dependabot will resolve any conflicts with this PR as long as you don't alter it yourself. You can also trigger a rebase manually by commenting @dependabot rebase.

---

Note: This repo was added to Dependabot recently, so you'll receive a maximum of 10 PRs for your first few update runs. Once an update run creates fewer than 10 PRs we'll remove that limit.

You can always request more updates by clicking Bump now in your Dependabot dashboard.

Dependabot commands and options

You can trigger Dependabot actions by commenting on this PR:

• @dependabot rebase will rebase this PR
• @dependabot recreate will recreate this PR, overwriting any edits that have been made to it
• @dependabot merge will merge this PR after your CI passes on it
• @dependabot squash and merge will squash and merge this PR after your CI passes on it
• @dependabot cancel merge will cancel a previously requested merge and block automerging
• @dependabot reopen will reopen this PR if it is closed
• @dependabot close will close this PR and stop Dependabot recreating it. You can achieve the same result by closing it manually
• @dependabot ignore this major version will close this PR and stop Dependabot creating any more for this major version (unless you reopen the PR or upgrade to it yourself)
• @dependabot ignore this minor version will close this PR and stop Dependabot creating any more for this minor version (unless you reopen the PR or upgrade to it yourself)
• @dependabot ignore this dependency will close this PR and stop Dependabot creating any more for this dependency (unless you reopen the PR or upgrade to it yourself)
• @dependabot use these labels will set the current labels as the default for future PRs for this repo and language
• @dependabot use these reviewers will set the current reviewers as the default for future PRs for this repo and language
• @dependabot use these assignees will set the current assignees as the default for future PRs for this repo and language
• @dependabot use this milestone will set the current milestone as the default for future PRs for this repo and language
• @dependabot badge me will comment on this PR with code to add a "Dependabot enabled" badge to your readme

Additionally, you can set the following in your Dependabot dashboard:

• Update frequency (including time of day and day of week)
• Automerge options (never/patch/minor, and dev/runtime dependencies)
• Pull request limits (per update run and/or open at any time)
• Out-of-range updates (receive only lockfile updates, if desired)
• Security updates (receive only security updates, if desired)

Finally, you can contact us by mentioning @dependabot.