Bug fixing

regioncode 0.1.1

• Styled function with tidyverse style
• Rewrote method as convert_to
• Rewrote incompleteName as incomplete_name
• Rewrote language_region and language_trans as to_dialect
• Simplified the codes.
• Added more detailed warning messages.

regioncode 0.0.9

• Enable to provincial-level conversion with province
• Fixed the error of incompleteName
• Simplified the codes.
• Add parameter topinyin & method "2area"
• Remove unnecessary warning about 'code2code'
• Fix the bug in language_region