Upgrade mysql2 to version 0.5.1

[depfu]

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

name	version specification	new version
mysql2	~> 0.4.10	0.5.1

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

What changed?

✳️ mysql2 ( → 0.5.1) · Repo · Changelog

Release Notes

From the Github release:

New Features

• None

Bug Fixes

• Fix with --with-mysql-dir (#952)
• Prevent command out of sync errors with Prepared Statements (#956, #957, #958)

Changes

• Specs: Use the prepared statement performance schema if available (#960)
• README mysql2 0.5.x works with Rails 5.0.7, 5.1.6, and higher
• README be sure to read about the known limitations of prepared statements

Commits

See the full diff on Github. The new version differs by 7 commits:

• Bump version to 0.5.1
• Use the prepared statement performance schema if available (#960)
• README mysql2 0.5.x works with Rails 5.0.7, 5.1.6, and higher
• README be sure to read about the known limitations of prepared statements
• Add missing FREE_BINDS to prepared statement streaming error case (#958)
• Fix with --with-mysql-dir (#952)
• Prevent command out of sync errors with Prepared Statements (#958)

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