Modify Popular Component to set state of selectedLanguage   -Add constructor to have a default state of selectedLanguage   -Add updateLanguage method to set state   -Add onClick function to update state of selectedLanguage   -Add style to color the state of selectedLanguage
Modify Popular Component to set state of selectedLanguage
  -Add constructor to have a default state of selectedLanguage
  -Add updateLanguage method to set state
  -Add onClick function to update state of selectedLanguage
  -Add style to color the state of selectedLanguage

ryuzaki644/github-battle,ryuzaki644/github-battle