Bump github.com/mailgun/mailgun-go/v4 from 4.15.0 to 4.15.1 (#27)

Bumps
[github.com/mailgun/mailgun-go/v4](https://github.com/mailgun/mailgun-go)
from 4.15.0 to 4.15.1.
<details>
<summary>Release notes</summary>
<p><em>Sourced from <a
href="https://github.com/mailgun/mailgun-go/releases">github.com/mailgun/mailgun-go/v4's
releases</a>.</em></p>
<blockquote>
<h2>v4.15.1</h2>
<h2>What's Changed</h2>
<ul>
<li>DE-1328 Fix GetStoredAttachment and add nilaway by <a
href="https://github.com/vtopc"><code>@​vtopc</code></a> in <a
href="https://redirect.github.com/mailgun/mailgun-go/pull/327">mailgun/mailgun-go#327</a></li>
</ul>
<p><strong>Full Changelog</strong>: <a
href="https://github.com/mailgun/mailgun-go/compare/v4.15.0...v4.15.1">https://github.com/mailgun/mailgun-go/compare/v4.15.0...v4.15.1</a></p>
</blockquote>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a
href="https://github.com/mailgun/mailgun-go/commit/a7b6ae6a324c4714e985cdbe22a762c85fa829fc"><code>a7b6ae6</code></a>
DE-1328 Fix GetStoredAttachment and add nilaway (<a
href="https://redirect.github.com/mailgun/mailgun-go/issues/327">#327</a>)</li>
<li>See full diff in <a
href="https://github.com/mailgun/mailgun-go/compare/v4.15.0...v4.15.1">compare
view</a></li>
</ul>
</details>
<br />


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go.mod

@@ -6,7 +6,7 @@ require (
 	github.com/emersion/go-smtp v0.21.3
 	github.com/go-ozzo/ozzo-validation/v4 v4.3.0
 	github.com/kelseyhightower/envconfig v1.4.0
-	github.com/mailgun/mailgun-go/v4 v4.15.0
+	github.com/mailgun/mailgun-go/v4 v4.15.1
 	github.com/pkg/errors v0.9.1
 	github.com/prometheus/client_golang v1.20.3
 	github.com/sirupsen/logrus v1.9.3

go.sum

@@ -40,8 +40,8 @@ github.com/kr/text v0.2.0 h1:5Nx0Ya0ZqY2ygV366QzturHI13Jq95ApcVaJBhpS+AY=
 github.com/kr/text v0.2.0/go.mod h1:eLer722TekiGuMkidMxC/pM04lWEeraHUUmBw8l2grE=
 github.com/kylelemons/godebug v1.1.0 h1:RPNrshWIDI6G2gRW9EHilWtl7Z6Sb1BR0xunSBf0SNc=
 github.com/kylelemons/godebug v1.1.0/go.mod h1:9/0rRGxNHcop5bhtWyNeEfOS8JIWk580+fNqagV/RAw=
-github.com/mailgun/mailgun-go/v4 v4.15.0 h1:3NQU0r2XItJbyIZ21iBI9ps0+vPIMoGyI2XK7ZTN/DQ=
-github.com/mailgun/mailgun-go/v4 v4.15.0/go.mod h1:L9s941Lgk7iB3TgywTPz074pK2Ekkg4kgbnAaAyJ2z8=
+github.com/mailgun/mailgun-go/v4 v4.15.1 h1:/xL/JBF/SWd3m9iscO1wKpv9tzcK21eRRJAqIlyk3EQ=
+github.com/mailgun/mailgun-go/v4 v4.15.1/go.mod h1:L9s941Lgk7iB3TgywTPz074pK2Ekkg4kgbnAaAyJ2z8=
 github.com/modern-go/concurrent v0.0.0-20180228061459-e0a39a4cb421/go.mod h1:6dJC0mAP4ikYIbvyc7fijjWJddQyLn8Ig3JB5CqoB9Q=
 github.com/modern-go/concurrent v0.0.0-20180306012644-bacd9c7ef1dd h1:TRLaZ9cD/w8PVh93nsPXa1VrQ6jlwL5oN8l14QlcNfg=
 github.com/modern-go/concurrent v0.0.0-20180306012644-bacd9c7ef1dd/go.mod h1:6dJC0mAP4ikYIbvyc7fijjWJddQyLn8Ig3JB5CqoB9Q=