Revert "Bump better_errors from 2.9.1 to 2.10.0"

This reverts commit 799ca77.

Author: doerfli

Gemfile.lock

@@ -89,10 +89,10 @@ GEM
       aws-eventstream (~> 1, >= 1.0.2)
     backport (1.2.0)
     benchmark (0.2.1)
-    better_errors (2.10.0)
+    better_errors (2.9.1)
+      coderay (>= 1.0.0)
       erubi (>= 1.0.0)
       rack (>= 0.9.0)
-      rouge (>= 1.0.0)
     bindex (0.8.1)
     binding_of_caller (1.0.0)
       debug_inspector (>= 0.0.1)
@@ -115,6 +115,7 @@ GEM
     chromedriver-helper (2.1.1)
       archive-zip (~> 0.10)
       nokogiri (~> 1.8)
+    coderay (1.1.3)
     coffee-rails (5.0.0)
       coffee-script (>= 2.2.0)
       railties (>= 5.2.0)
@@ -292,7 +293,6 @@ GEM
     reverse_markdown (2.1.1)
       nokogiri
     rexml (3.2.5)
-    rouge (4.1.0)
     rspec-core (3.12.0)
       rspec-support (~> 3.12.0)
     rspec-expectations (3.12.2)