• compatible with PHP 7
• bar.css: fixed width of H1 #124
• Debugger: allowed using stream wrappers as log directory #125
• Debugger: reserves some memory that is used when error "Allowed Memory Exhausted" occurs
• Bar, Debugger: handles Throwable errors
• Debugger: cleans output buffers on strictMode error
• Debugger: error exit code changed from 254 to 255 for Error
• Debugger: more readable exceptions in console
• Helpers::getSuggestion() better balance. Replacement is more expensive than insertion/deletion.
• Helpers::editorUri default $line is 1; line is required by open-editor.js

For the details you can have a look at the diff.