Bump github.com/mrz1836/postmark from 1.6.2 to 1.6.3

Bumps [github.com/mrz1836/postmark](https://github.com/mrz1836/postmark) from 1.6.2 to 1.6.3.
- [Release notes](https://github.com/mrz1836/postmark/releases)
- [Changelog](https://github.com/mrz1836/postmark/blob/master/.goreleaser.yml)
- [Commits](mrz1836/postmark@v1.6.2...v1.6.3)

---
updated-dependencies:
- dependency-name: github.com/mrz1836/postmark
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

go.mod

@@ -7,7 +7,7 @@ require (
 	github.com/domodwyer/mailyak v3.1.1+incompatible
 	github.com/mattbaird/gochimp v0.0.0-20200820164431-f1082bcdf63f
 	github.com/mrz1836/go-ses v0.3.1
-	github.com/mrz1836/postmark v1.6.2
+	github.com/mrz1836/postmark v1.6.3
 )
 
 require (

go.sum

@@ -21,8 +21,8 @@ github.com/mattbaird/gochimp v0.0.0-20200820164431-f1082bcdf63f h1:Sbn1gG/7kAsH2
 github.com/mattbaird/gochimp v0.0.0-20200820164431-f1082bcdf63f/go.mod h1:UaYd2gciRA1AoYEN6S+EiSNFK/0XHj9e1Wgloicgh6s=
 github.com/mrz1836/go-ses v0.3.1 h1:G1tqZYkzW1jpObeaP4YZrPVkJUq5P+Y2WdlStsfU1HI=
 github.com/mrz1836/go-ses v0.3.1/go.mod h1:xh4W5ebe4BILV7v8jXSnHi3mghJ0anGLvnPZEGTAG7w=
-github.com/mrz1836/postmark v1.6.2 h1:QxKCwad4Nxlh81f4YQGXvyd5MF4dV1lgMTAKQZhqPME=
-github.com/mrz1836/postmark v1.6.2/go.mod h1:6z5MxAH00Kj44owtQaryv9Pbqp5OKT3wWcRSydB0p0A=
+github.com/mrz1836/postmark v1.6.3 h1:g5Zv6hGZfqTR79Xb7my5O1aVuiBxWQ0jI2jFzu+Ou9k=
+github.com/mrz1836/postmark v1.6.3/go.mod h1:6z5MxAH00Kj44owtQaryv9Pbqp5OKT3wWcRSydB0p0A=
 github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
 github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
 github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=