Showing latest changes in Angular without clearing browser history (untested)

 In index.html do -

<meta http-equiv="Cache-control" content="no-cache">

On apache server in /var/www/.htaccess do -

RewriteEngine On
<FilesMatch "\.(html|htm|js|css)$">
  FileETag None
  <IfModule mod_headers.c>
    Header unset ETag
    Header set Cache-Control "max-age=0, no-cache, no-store, must-revalidate"
    Header set Pragma "no-cache"
    Header set Expires "Wed, 12 Jan 1980 05:00:00 GMT"
  </IfModule>
</FilesMatch>