* Update reline-0.5.7

* Update irb-1.13.1

(https://github.com/ruby/irb/pull/783)

With either `IRB.conf[:USE_PAGER] = false` or `--no-pager` commnad line flag.

I decided use `--no-pager` instead of `--use-pager` because it matches with
Pry and git's command line flags.

https://github.com/ruby/irb/commit/df1c3b9042

(https://github.com/ruby/irb/pull/754)

* Add command line option to select which completor to use

* Add test for completor argv

https://github.com/ruby/irb/commit/1dec2708c9

(https://github.com/ruby/irb/pull/569)

We don't have to load another file to define the legacy encoding aliases
map because there's only one definition of it. We can define it in
locale.rb directly.

https://github.com/ruby/irb/commit/a55ace0791

https://github.com/ruby/irb/commit/cef125850d

https://github.com/ruby/irb/commit/7a94bc4135

https://github.com/ruby/irb/commit/07fae94862

https://github.com/ruby/irb/commit/f09a1874b6

Also add --script option to turn the option back on.

Previously there wasn't a way to get an interactive IRB session
and access arguments provided on the command line.

Additionally, handle `-` as script as stdin. In Unix-like tools, `-`
means to take standard input instead of a file.  This doesn't
result in exactly the same output for:

```
echo 'p ARGV' > args.rb; irb args.rb a b c
```

and

```
echo 'p ARGV' | irb - a b c
```

Due to how irb handles whether stdin is a tty.

However, this change allows use of `-` as a argument, instead of
giving an unrecognized switch error. This required some small
changes to context.rb (to handle `-` as standard input) and
input-method.rb (to have FileInputMethod accept IO arguments in
addition to strings).

Implements [Feature #15371]

https://github.com/ruby/irb/commit/4192683ba2