Uncomment byebug in framework Gemfile

History:

1. `debugger` was there until d2ed433b where it was commented out, and I
   couldn't figure out why

2. Since then we inherited that when switching to `byebug` in 93559da4

Reasons:

1. It's nice to have a debugger when working on framework bugs

2. It's an uncommented dependency in app Gemfiles since Rails 4.2 (see fbe38c9e)

1 files changed, 1 insertions, 1 deletions

diff --git a/Gemfile b/Gemfile
index ddaaacdc59..47e87f75cd 100644
--- a/Gemfile
+++ b/Gemfile
@@ -65,7 +65,7 @@ group :test do
 
   platforms :mri do
     gem 'stackprof'
-    # gem 'byebug'
+    gem 'byebug'
   end
 
   gem 'benchmark-ips'