Bump better_errors from 2.5.0 to 2.8.0

Bumps [better_errors](https://github.com/BetterErrors/better_errors) from 2.5.0 to 2.8.0.
- [Release notes](https://github.com/BetterErrors/better_errors/releases)
- [Commits](BetterErrors/better_errors@v2.5.0...v2.8.0)

---
updated-dependencies:
- dependency-name: better_errors
  dependency-type: direct:development
...

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

Gemfile.lock

@@ -53,7 +53,7 @@ GEM
     ast (2.4.0)
     awesome_print (1.8.0)
     bcrypt (3.1.13)
-    better_errors (2.5.0)
+    better_errors (2.8.0)
       coderay (>= 1.0.0)
       erubi (>= 1.0.0)
       rack (>= 0.9.0)
@@ -85,7 +85,7 @@ GEM
     chromedriver-helper (2.1.0)
       archive-zip (~> 0.10)
       nokogiri (~> 1.8)
-    coderay (1.1.2)
+    coderay (1.1.3)
     coffee-rails (4.2.2)
       coffee-script (>= 2.2.0)
       railties (>= 4.0.0)
@@ -119,7 +119,7 @@ GEM
       dry-configurable (~> 0.1, >= 0.1.3)
     dry-core (0.4.7)
       concurrent-ruby (~> 1.0)
-    erubi (1.9.0)
+    erubi (1.10.0)
     execjs (2.7.0)
     ffi (1.9.25)
     formatador (0.2.5)
@@ -206,7 +206,9 @@ GEM
     mime-types (3.2.2)
       mime-types-data (~> 3.2015)
     mime-types-data (3.2018.0812)
-    mimemagic (0.3.2)
+    mimemagic (0.3.10)
+      nokogiri (~> 1)
+      rake
     mini_mime (1.0.1)
     mini_portile2 (2.4.0)
     minitest (5.14.0)