Patch release that fixes restarts in long running jobs with lightweight servers and SQL Server-based job storage, and a few other minor issues.

Hangfire.Core

• Changed – Update Bootstrap to the custom version of 3.4.2 to avoid false alerts on unused features.
• Fixed – Typos in Portuguese translation (by @VianaArthur).
• Fixed – Unnecessary recurring job update transaction when nothing is changed after an error.
• Fixed – Glyphicons from Bootstrap are not displaying after upgrading to version 1.8.19.

Hangfire.SqlServer

• Fixed – Sliding invisibility timeout isn’t prolonged in lightweight servers, causing jobs to be restarted.