v0.21.3

• Breaking Change: Remove support for setting rest-client.showEnvironmentStatusBarItem in favor of automatically hide status bar for non-http file feature
• Feature: Support custom display formats in datetime system variable (@connelhooley)
• Improvement: Hide the environment status bar for non-http file
• Bug Fix: Add title for scroll-to-top button
• Bug Fix: Faield to generate Objective-C code snippet for request body contains null characters