Updates to release v2.1.3

Fix kartik-v#268: Add Bootstrap 4.x Support

Fix kartik-v#241: Enhancements to Select2 Krajee theme styles

Updates to release v2.1.0

Updates to release v2.0.9

Fix kartik-v#126: Enhance event handling for Krajee's additional feat…

…ures

Update to release v2.0.7

Updates to release v2.0.6 fix kartik-v#102, fix kartik-v#103, fix kar…

…tik-v#104

Update to release v2.0.5

Update to release v2.0.4