What does this Pull Request do?

Bumps the version spec of the conflict, based upon bit of discussion on https://github.com/Islandora/islandora_defaults/pull/75

Related GitHub Issue: (link)
Other Relevant Links: (Google Groups discussion, related pull requests, Release pull requests, etc.)

What's new?

Does this change add any new dependencies? No.
Does this change require any other modifications to be made to the repository (i.e. Regeneration activity, etc.)? No.
Could this change impact execution of existing code? No.

How should this be tested?

Given a project with islandora_defaults of major version 2 installed, attempt to install islandora_mirador with this conflict statement.

... it should fail with something like:

$ composer require "islandora/islandora_mirador:dev-fix/conflict-spec as 2.x-dev"
./composer.json has been updated
Running composer update islandora/islandora_mirador --with-all-dependencies
Loading composer repositories with package information
Updating dependencies
Your requirements could not be resolved to an installable set of packages.

  Problem 1
    - islandora/islandora_defaults is locked to version 2.1.1 and an update of this package was not requested.
    - islandora/islandora_mirador dev-fix/conflict-spec conflicts with islandora/islandora_defaults <=3.
    - Root composer.json requires islandora/islandora_mirador dev-fix/conflict-spec as 2.x-dev -> satisfiable by islandora/islandora_mirador[dev-fix/conflict-spec].

Installation failed, reverting ./composer.json and ./composer.lock to their original content.

... independent of the -W flag being passed; however, requiring both should work:

$ composer require "islandora/islandora_defaults:^3" "islandora/islandora_mirador:dev-fix/conflict-spec as 2.x-dev"
./composer.json has been updated
Running composer update islandora/islandora_defaults islandora/islandora_mirador
Loading composer repositories with package information
Updating dependencies
Lock file operations: 1 install, 1 update, 0 removals
  - Upgrading islandora/islandora_defaults (2.1.1 => 3.x-dev 443fca7)
  - Locking islandora/islandora_mirador (dev-fix/conflict-spec 44f1483)
Writing lock file
Installing dependencies from lock file (including require-dev)
Package operations: 1 install, 1 update, 0 removals
  - Downloading islandora/islandora_mirador (dev-fix/conflict-spec 44f1483)
  - Downloading islandora/islandora_defaults (3.x-dev 443fca7)
  - Installing islandora/islandora_mirador (dev-fix/conflict-spec 44f1483): Extracting archive
  - Upgrading islandora/islandora_defaults (2.1.1 => 3.x-dev 443fca7): Extracting archive
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Package silex/silex is abandoned, you should avoid using it. Use symfony/flex instead.
Package symfony/debug is abandoned, you should avoid using it. Use symfony/error-handler instead.
Generating autoload files
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No security vulnerability advisories found

Documentation Status

Does this change existing behaviour that's currently documented?
Does this change require new pages or sections of documentation?
Who does this need to be documented for?
Associated documentation pull request(s): or documentation issue

Additional Notes:

Any additional information that you think would be helpful when reviewing this PR.

Interested parties

Tag (@ mention) interested parties or, if unsure, @Islandora/committers

Islandora / islandora_mirador

Update the spec in the islandora_defaults conflict spec. #8