Update activemodel requirement from ~> 4.2 to >= 4.2, < 7.0

[dependabot[bot]]

Updates the requirements on activemodel to permit the latest version.

Commits

• e06a1e0 Prep release
• 474b739 Preparing for 4.2.11 release
• 6b9a1ac Update changelog headers for Rails 4.2.10
• b62714d Preparing for 4.2.10 release
• 84e0a23 Update CHANGELOGS for Rails 4.2.10.rc1
• bd6ccff Preparing for 4.2.10.rc1 release
• 79c9f2e Preparing for 4.2.9 release
• e13f5ba Preparing for 4.2.9.rc2 release
• 3c184ed Preparing for 4.2.9.rc1 release
• 8ee7161 Preparing for 4.2.8 release
• Additional commits viewable in compare view

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