add link to upgrade gist

getsentry · Apr 20, 2017 · 7387185 · 7387185
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diff --git a/CHANGELOG.md b/CHANGELOG.md
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 ## master
 
 ## 4.0.0 (2017-04-20)
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+See these [`3.0.0` to `4.0.0` upgrade instructions](https://gist.github.com/mitchellhenke/5248b3073f113309fa25550a0e4126d4) to update your existing app.
+
 * Enhancements
   * Bump hackney to a version that isn't retired (#135)
   * Improve Logger reporting (#136)