Add Pull.cli_options

I came across the pattern in this diff while browsing the
[rake](https://github.com/ruby/rake/)
source code, and I thought it was worth repeating in quran-json.

README.md

@@ -45,7 +45,8 @@ the content of The Quran in multiple languages.
     Usage: quran-json pull [OPTIONS]
       -l, --locale LOCALE    ar, en, pt, fa, nl, fr, or it (default: en)
       -r, --replace          Replace existing JSON files (default: no)
-      -u, --update               Only update the surah metadata (implies -r, default: no)
+      -u, --update           Replace surah metadata with an updated copy (implies -r, default: no)
+
 
 <p align="left">
   <strong>Thanks</strong>
@@ -53,12 +54,12 @@ the content of The Quran in multiple languages.
 
 First and foremost, Alhamdulillah.
 
-Thanks to the following websites for making the content available to download:
+Thanks to the following websites for providing the downloadable content:
 
   * https://searchtruth.com for the original Arabic, and the Italian translation.
   * https://quran.com for the English, Farsi, Portuguese, Dutch, and French translations.
 
-And thanks to the translators of the content:
+And sincere thanks to the translators of the content:
 
   * _Dr. Mustafa Khattab_ for the English translation.
   * _Hussein Taji Kal Dari_ for the Farsi translation.
@@ -72,4 +73,4 @@ And thanks to the translators of the content:
 
 The "source code" is released under the [GPL](./LICENSE) license.
 <br>
-The content is copyrighted to the translators (named above).
+The content is copyrighted to the translators (listed above).

lib/quran-json/quran/json/pull.rb

@@ -15,20 +15,35 @@ class Quran::JSON::Pull
 
   def self.cli(argv)
     op = nil
-    options = Ryo({locale: "en", replace: false, update: false})
-    OptionParser.new(nil, 26, " " * 2) do |o|
-      o.banner = "Usage: quran-json pull [OPTIONS]"
+    result = Ryo({locale: "en", replace: false, update: false})
+    OptionParser.new(nil, 22, " " * 2) do |o|
       op = o
-      o.on("-l", "--locale LOCALE", "ar, en, pt, fa, nl, fr, or it (default: en)")
-      o.on("-r", "--replace", "Replace existing JSON files (default: no)")
-      o.on("-u", "--update", "Only update the surah metadata (implies -r, default: no)")
-    end.parse(argv, into: options)
-    options
+      op.banner = "Usage: quran-json pull [OPTIONS]"
+      cli_options.each { op.on(*_1) }
+    end.parse(argv, into: result)
+    result
   rescue
     puts op.help
     exit
   end
 
+  def self.cli_options
+    [
+      [
+        "-l", "--locale LOCALE",
+        "ar, en, pt, fa, nl, fr, or it (default: en)"
+      ],
+      [
+        "-r", "--replace",
+        "Replace existing JSON files (default: no)"
+      ],
+      [
+        "-u", "--update",
+        "Replace surah metadata with an updated copy (implies -r, default: no)"
+      ]
+    ]
+  end
+
   def initialize(options)
     @options = options
     @source = sources[options.locale]