Upgrade rake to version 11.1.2

[depfutester]

Hello,

We've upgraded a dependency and all tests pass. \o/

gem name	version specification	new version
rake	~> 10.0	11.1.2

You should probably take a good look at this before merging this pull request, of course.

These are the last commits on the dependency:

• bump version to Rake 11.1.2
• Merge pull request #126 from ruby/fix-verbose-option
• Remove -W option. It's unexpected change from Rake 10

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This is an automated pull request by depfu. You're getting it because someone configured depfu to automatically update dependencies on this project.