Fix: CI error

Add .to_i is there for positional insertions

lib/jekyll/scholar/extras/bibliography_bytype.rb

@@ -111,12 +111,12 @@ module Jekyll
           # Is there a link for code
           if entry.field?(:code)
             code_url = "<div class=\"pure-button csl-code\"><a href=\"" + entry.code.to_s + "\">CODE</a></div>"
-            reference.insert(reference.rindex('</div>'), code_url.to_s )                      
+            reference.insert(reference.rindex('</div>').to_i, code_url.to_s )                      
           end   
 
                   # Generate the bibtex button
           tex_bib = "<div class=\"pure-button csl-bibtex\"><a href=\"" + bibtex_link_for(entry).to_s + "\">BIBTEX</a></div>"
-          reference.insert(reference.rindex('</div>'), tex_bib.to_s )
+          reference.insert(reference.rindex('</div>').to_i, tex_bib.to_s )
           
           content_tag config['bibliography_item_tag'], reference
           content_tag "li class=\"" + render_ref_img(entry) + "\"", reference

lib/jekyll/scholar/extras/bibliography_year.rb

@@ -134,7 +134,7 @@ module Jekyll
                   # Is there a link for code
                   if entry.field?(:code)
                     code_url = "<div class=\"pure-button csl-code\"><a href=\"" + entry.code.to_s + "\">CODE</a></div>"
-                    reference.insert(reference.rindex('</div>'), code_url.to_s )                      
+                    reference.insert(reference.rindex('</div>').to_i, code_url.to_s )                      
                   end   
 
                   
@@ -142,8 +142,7 @@ module Jekyll
 
                 # Generate the bibtex button for all pubs
                 tex_bib = "<div class=\"pure-button csl-bibtex\"><a href=\"" + bibtex_link_for(entry).to_s + "\">BIBTEX</a></div>"
-                puts reference.rindex('</div>')
-                reference.insert(reference.rindex('</div>'), tex_bib.to_s )
+                reference.insert(reference.rindex('</div>').to_i, tex_bib.to_s )
                 
                 # Content tag is dependent on type of article.
                 content_tag "li class=\"" + render_ref_img(entry) + "\"", reference