rubocop: fix offences of the Style/RedundantException cop

.rubocop_todo.yml

@@ -314,12 +314,6 @@ Style/PerlBackrefs:
     - 'lib/pry/method.rb'
     - 'lib/pry/rubygem.rb'
 
-# Offense count: 1
-# Cop supports --auto-correct.
-Style/RedundantException:
-  Exclude:
-    - 'lib/pry/repl_file_loader.rb'
-
 # Offense count: 8
 # Cop supports --auto-correct.
 Style/RedundantParentheses:

lib/pry/repl_file_loader.rb

@@ -12,7 +12,7 @@ class Pry
   class REPLFileLoader
     def initialize(file_name)
       full_name = File.expand_path(file_name)
-      raise RuntimeError, "No such file: #{full_name}" unless File.exist?(full_name)
+      raise "No such file: #{full_name}" unless File.exist?(full_name)
 
       define_additional_commands
       @content = File.read(full_name)