DEV: Fix rubocop warnings (#199)

bin/prometheus_exporter

@@ -88,7 +88,7 @@ def run
   end
 
   if custom_collector_filename
-    eval File.read(custom_collector_filename), nil, File.expand_path(custom_collector_filename)
+    require File.expand_path(custom_collector_filename)
     found = false
 
     base_klass = PrometheusExporter::Server::CollectorBase
@@ -108,7 +108,7 @@ def run
 
   if custom_type_collectors_filenames.length > 0
     custom_type_collectors_filenames.each do |t|
-      eval File.read(t), nil, File.expand_path(t)
+      require File.expand_path(t)
     end
 
     ObjectSpace.each_object(Class) do |klass|

lib/prometheus_exporter/instrumentation/sidekiq.rb

@@ -73,7 +73,7 @@ module PrometheusExporter::Instrumentation
       # of the delayed extensions
       # https://github.com/mperham/sidekiq/blob/master/lib/sidekiq/extensions/class_methods.rb
       begin
-        (target, method_name, _args) = YAML.load(msg['args'].first)
+        (target, method_name, _args) = YAML.safe_load(msg['args'].first)
         if target.class == Class
           "#{target.name}##{method_name}"
         else