Changelog for 2.76

What's new in 2.76 (2017-08-27)

• Update Remoting from 3.10 to 3.11 to improve stability and diagnosability. (issue 37567, issue 43985, issue 45023, issue 45233, issue 45522, issue 46259, full changelog)
• Major update of the Bulgarian translation. (pull 2983)
• Internal: Allow EnvironmentContributingAction to support Run in addition to AbstractProject. (issue 29537)
• Internal: Updated parent POM; Jenkins core now requires Maven 3.3.9 or newer to build. (pull 2985)