Update _config.yml

Author: rohithay

_config.yml

@@ -20,14 +20,14 @@ description: >- # this means to ignore newlines until "baseurl:"
 baseurl: "" # the subpath of your site, e.g. /blog
 url: "" # the base hostname & protocol for your site, e.g. http://example.com
 twitter_username: Yarlagaddarohi
-github_username:  yrohitha
+github_username:  rohithay
 
 # Build settings
 markdown: kramdown
 kramdown:
   input: GFM
   syntax_highlighter: rouge
-theme: minima
+theme: jekyll-theme-chirpy
 plugins:
   - jekyll-feed
   - jekyll-gist