Bump letter_opener_web from 1.3.4 to 1.4.0

Bumps [letter_opener_web](https://github.com/fgrehm/letter_opener_web) from 1.3.4 to 1.4.0.
- [Release notes](https://github.com/fgrehm/letter_opener_web/releases)
- [Changelog](https://github.com/fgrehm/letter_opener_web/blob/master/CHANGELOG.md)
- [Commits](https://github.com/fgrehm/letter_opener_web/compare/v1.3.4...v1.4.0)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

Gemfile

@@ -77,7 +77,7 @@ group :development, :test do
   gem "i18n-tasks", "~> 0.9.31"
   gem "knapsack_pro", "~> 2.6.0"
   gem "launchy", "~> 2.4.3"
-  gem "letter_opener_web", "~> 1.3.4"
+  gem "letter_opener_web", "~> 1.4.0"
   gem "spring", "~> 2.0.1"
   gem "spring-commands-rspec", "~> 1.0.4"
 end

Gemfile.lock

@@ -327,9 +327,9 @@ GEM
       kramdown (~> 2.0)
     launchy (2.4.3)
       addressable (~> 2.3)
-    letter_opener (1.6.0)
+    letter_opener (1.7.0)
       launchy (~> 2.2)
-    letter_opener_web (1.3.4)
+    letter_opener_web (1.4.0)
       actionmailer (>= 3.2)
       letter_opener (~> 1.0)
       railties (>= 3.2)
@@ -414,7 +414,7 @@ GEM
     pg_search (2.3.0)
       activerecord (>= 4.2)
       activesupport (>= 4.2)
-    public_suffix (4.0.5)
+    public_suffix (4.0.6)
     puma (4.3.5)
       nio4r (~> 2.0)
     rack (2.2.3)
@@ -679,7 +679,7 @@ DEPENDENCIES
   kaminari (~> 1.2.1)
   knapsack_pro (~> 2.6.0)
   launchy (~> 2.4.3)
-  letter_opener_web (~> 1.3.4)
+  letter_opener_web (~> 1.4.0)
   mdl (~> 0.11.0)
   newrelic_rpm (~> 4.1.0.333)
   omniauth (~> 1.9.1)