Fix linting (#639)

Author: coalest

lib/mini_profiler.rb

@@ -417,7 +417,7 @@ def matches_action?(action, env)
     end
 
     def action_parameters(env)
-      query_params = Rack::Utils.parse_nested_query(env['QUERY_STRING'])
+      Rack::Utils.parse_nested_query(env['QUERY_STRING'])
     end
 
     def inject_profiler(env, status, headers, body)

lib/mini_profiler/actions.rb

@@ -130,7 +130,7 @@ def serve_profile_memory(env, client_settings)
 
         unless defined?(MemoryProfiler) && MemoryProfiler.respond_to?(:report)
           message = "Please install the memory_profiler gem and require it: add gem 'memory_profiler' to your Gemfile"
-          status, headers, body = @app.call(env)
+          _status, headers, body = @app.call(env)
           body.close if body.respond_to? :close
 
           return client_settings.handle_cookie(