[openstreetmap/openstreetmap-website] Bump strong_migrations from 0.6.8 to 0.7.0 (#2731)

[dependabot[bot]]

Bumps [strong_migrations](https://github.com/ankane/strong_migrations) from 0.6.8 to 0.7.0.
<details>
<summary>Changelog</summary>
<p><em>Sourced from <a href="https://github.com/ankane/strong_migrations/blob/master/CHANGELOG.md">strong_migrations's changelog</a>.</em></p>
<blockquote>
<h2>0.7.0 (2020-07-22)</h2>
<ul>
<li>Added <code>check_down</code> option</li>
<li>Added check for <code>change_column</code> with <code>null: false</code></li>
<li>Added check for <code>validate_foreign_key</code></li>
<li>Improved error messages</li>
<li>Made auto analyze less verbose in Postgres</li>
<li>Decreasing the length limit of a <code>varchar</code> column or adding a limit is not safe in Postgres</li>
<li>Removed safety checks for <code>db</code> rake tasks (Rails 5+ handles this)</li>
</ul>
</blockquote>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a href="https://github.com/ankane/strong_migrations/commit/25ece0dfde547d91404578c8ba7267e2e809342a"><code>25ece0d</code></a> Version bump to 0.7.0 [skip ci]</li>
<li><a href="https://github.com/ankane/strong_migrations/commit/7321a4cef6bdb6d040185d1b583f6b847f99c91e"><code>7321a4c</code></a> Added check for change_column with null: false</li>
<li><a href="https://github.com/ankane/strong_migrations/commit/7f11b0ecf904aa9f5711ea4aca9ba54a8b806362"><code>7f11b0e</code></a> Fixed docs [skip ci]</li>
<li><a href="https://github.com/ankane/strong_migrations/commit/bdb6f9865d6e401c642d32f6fd7665cfbd4be738"><code>bdb6f98</code></a> Fixed docs [skip ci]</li>
<li><a href="https://github.com/ankane/strong_migrations/commit/778a63b5dd77a3f040dfaca4890ec2d28b034695"><code>778a63b</code></a> Improved instructions [skip ci]</li>
<li><a href="https://github.com/ankane/strong_migrations/commit/691e493e0af22b8d09766da5b519acbfff45a6f9"><code>691e493</code></a> Added definition for dangerous [skip ci]</li>
<li><a href="https://github.com/ankane/strong_migrations/commit/9eee1d8ec4cf9fdd51b4adf732cc1f89c3634faf"><code>9eee1d8</code></a> Better variable name</li>
<li><a href="https://github.com/ankane/strong_migrations/commit/13359d185fbec4f074a5c94161c6673905b8253a"><code>13359d1</code></a> Added case to readme [skip ci]</li>
<li><a href="https://github.com/ankane/strong_migrations/commit/138c343e06efc662da36ecd4e4afe6487b58bb46"><code>138c343</code></a> Changing between text and varchar with no limit is safe</li>
<li><a href="https://github.com/ankane/strong_migrations/commit/851cccca940d66eed0933d356e278e231c318c86"><code>851cccc</code></a> Added test for adding varchar limit</li>
<li>Additional commits viewable in <a href="https://github.com/ankane/strong_migrations/compare/v0.6.8...v0.7.0">compare view</a></li>
</ul>
</details>
<br />


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</details>
You can view, comment on, or merge this pull request online at:

  https://github.com/openstreetmap/openstreetmap-website/pull/2731

-- Commit Summary --

  * Bump strong_migrations from 0.6.8 to 0.7.0

-- File Changes --

    M Gemfile.lock (6)

-- Patch Links --

https://github.com/openstreetmap/openstreetmap-website/pull/2731.patch
https://github.com/openstreetmap/openstreetmap-website/pull/2731.diff

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