Don't require stackprof in Gemfile

Signed-off-by: Rémy Coutable <remy@rymai.me>

Gemfile

@@ -355,7 +355,7 @@ group :development, :test do
   gem 'activerecord_sane_schema_dumper', '0.2'
-  gem 'stackprof', '~> 0.2.10'
+  gem 'stackprof', '~> 0.2.10', require: false
 end
 group :test do

bin/rspec-stackprof

 #!/usr/bin/env ruby
+require 'bundler/setup'
 require 'stackprof'
 $:.unshift 'spec'
 require 'rails_helper'
@@ -13,4 +14,4 @@ StackProf.run(mode: :wall, out: output_file, interval: interval) do
   RSpec::Core::Runner.run(ARGV, $stderr, $stdout)
 end
-system("stackprof #{output_file} --text --limit #{limit}")
+system("bundle exec stackprof #{output_file} --text --limit #{limit}")