Refactor: Use same code style to dump JSON file

Author: yasulab

get_data_from_japan.rb

@@ -9,13 +9,8 @@
 EVENTS_DATA = JSON.parse Net::HTTP.get(URI.parse "#{BASE_URL}/events.json"), symbolize_names: true
 EVENTS_JSON = JSON.pretty_generate EVENTS_DATA.sort_by{|dojo| dojo[:id]}
 
-File.open("dojos_japan.json", "w") do |file|
-  file.write(DOJOS_JSON)
-end
-
-File.open("events_japan.json", "w") do |file|
-  file.write(EVENTS_JSON)
-end
+File.open("dojos_japan.json",  "w") { |file| file.write(DOJOS_JSON)  }
+File.open("events_japan.json", "w") { |file| file.write(EVENTS_JSON) }
 
 # Show next step for developers
 puts DOJOS_JSON