Bump better_errors from 2.6.0 to 2.8.0 (#589)

Bumps [better_errors](https://github.com/BetterErrors/better_errors) from 2.6.0 to 2.8.0.
- [Release notes](https://github.com/BetterErrors/better_errors/releases)
- [Commits](BetterErrors/better_errors@v2.6.0...v2.8.0)

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

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Gemfile.lock

@@ -82,7 +82,7 @@ GEM
       aws-sigv4 (~> 1.1)
     aws-sigv4 (1.1.0)
       aws-eventstream (~> 1.0, >= 1.0.2)
-    better_errors (2.6.0)
+    better_errors (2.8.0)
       coderay (>= 1.0.0)
       erubi (>= 1.0.0)
       rack (>= 0.9.0)
@@ -105,7 +105,7 @@ GEM
       regexp_parser (~> 1.5)
       xpath (~> 3.2)
     childprocess (3.0.0)
-    coderay (1.1.2)
+    coderay (1.1.3)
     coffee-rails (5.0.0)
       coffee-script (>= 2.2.0)
       railties (>= 5.2.0)