update _config.yml

Author: vagsart

_config.yml

@@ -29,7 +29,7 @@ back_to_top: true # set to false to disable the back to top button
 # -----------------------------------------------------------------------------
 
 # repo color theme
-repo_theme_light: default # https://github.com/anuraghazra/github-readme-stats/blob/master/themes/README.md
+repo_theme_light: light # https://github.com/anuraghazra/github-readme-stats/blob/master/themes/README.md
 repo_theme_dark: dark # https://github.com/anuraghazra/github-readme-stats/blob/master/themes/README.md
 repo_trophies:
   enabled: true