Bump github.com/mailgun/mailgun-go/v4 from 4.20.5 to 4.21.0 (#42)

Bumps
[github.com/mailgun/mailgun-go/v4](https://github.com/mailgun/mailgun-go)
from 4.20.5 to 4.21.0.
<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>v4.21.0</h2>
<h2>What's Changed</h2>
<ul>
<li>DE-1372 Add getters for plain text message by <a
href="https://github.com/vtopc"><code>@​vtopc</code></a> in <a
href="https://redirect.github.com/mailgun/mailgun-go/pull/363">mailgun/mailgun-go#363</a></li>
</ul>
<p><strong>Full Changelog</strong>: <a
href="https://github.com/mailgun/mailgun-go/compare/v4.20.6...v4.21.0">https://github.com/mailgun/mailgun-go/compare/v4.20.6...v4.21.0</a></p>
<h2>v4.20.6</h2>
<h2>What's Changed</h2>
<ul>
<li>DE-1356 use any by <a
href="https://github.com/vtopc"><code>@​vtopc</code></a> in <a
href="https://redirect.github.com/mailgun/mailgun-go/pull/361">mailgun/mailgun-go#361</a></li>
<li>DE-1373 Get rid of defers in a loop by <a
href="https://github.com/vtopc"><code>@​vtopc</code></a> in <a
href="https://redirect.github.com/mailgun/mailgun-go/pull/362">mailgun/mailgun-go#362</a></li>
</ul>
<p><strong>Full Changelog</strong>: <a
href="https://github.com/mailgun/mailgun-go/compare/v4.20.5...v4.20.6">https://github.com/mailgun/mailgun-go/compare/v4.20.5...v4.20.6</a></p>
</blockquote>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a
href="https://github.com/mailgun/mailgun-go/commit/2c28b1e9c7bb4b0a38a20b6a97c14a2708f4d47a"><code>2c28b1e</code></a>
DE-1372 Add getters for plain text message (<a
href="https://redirect.github.com/mailgun/mailgun-go/issues/363">#363</a>)</li>
<li><a
href="https://github.com/mailgun/mailgun-go/commit/5003ccc3db5315bca20322225044820f6114c058"><code>5003ccc</code></a>
DE-1373 Get rid of defers in a loop (<a
href="https://redirect.github.com/mailgun/mailgun-go/issues/362">#362</a>)</li>
<li><a
href="https://github.com/mailgun/mailgun-go/commit/6ec38d2fce3b2a94f56a569aff8bd04a3905522b"><code>6ec38d2</code></a>
DE-1356 revive: use-any (<a
href="https://redirect.github.com/mailgun/mailgun-go/issues/361">#361</a>)</li>
<li>See full diff in <a
href="https://github.com/mailgun/mailgun-go/compare/v4.20.5...v4.21.0">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 v4.20.5
+	github.com/mailgun/mailgun-go/v4 v4.21.0
 	github.com/pkg/errors v0.9.1
 	github.com/prometheus/client_golang v1.20.5
 	github.com/sirupsen/logrus v1.9.3

go.sum

@@ -33,8 +33,8 @@ github.com/kylelemons/godebug v1.1.0 h1:RPNrshWIDI6G2gRW9EHilWtl7Z6Sb1BR0xunSBf0
 github.com/kylelemons/godebug v1.1.0/go.mod h1:9/0rRGxNHcop5bhtWyNeEfOS8JIWk580+fNqagV/RAw=
 github.com/mailgun/errors v0.4.0 h1:6LFBvod6VIW83CMIOT9sYNp28TCX0NejFPP4dSX++i8=
 github.com/mailgun/errors v0.4.0/go.mod h1:xGBaaKdEdQT0/FhwvoXv4oBaqqmVZz9P1XEnvD/onc0=
-github.com/mailgun/mailgun-go/v4 v4.20.5 h1:X0n0faLwHy8iQmCVrzOmJAwsAEGjvtcCu38patBUfbc=
-github.com/mailgun/mailgun-go/v4 v4.20.5/go.mod h1:768NjUvsxW8Ga8fHIPITmr5f/U8qmnQqnZ3/cs3StUc=
+github.com/mailgun/mailgun-go/v4 v4.21.0 h1:l9SvJDdFvQxB5J1/jCz6g3GELKJ5k2iCelShDuphv94=
+github.com/mailgun/mailgun-go/v4 v4.21.0/go.mod h1:768NjUvsxW8Ga8fHIPITmr5f/U8qmnQqnZ3/cs3StUc=
 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=