4.8.0

• Add JUnit XML report format (Naoki Kimurai)
• Sort ignore files by fingerprint and line (Ngan Pham)
• Catch dangerous concatenation in CheckExecute (Jacob Evelyn)
• User-friendly message when ignore config file has invalid JSON (D. Hicks)
• Freeze call index results, fix thread-safety issue
• Properly render confidence in Markdown report (#1446)
• Report old warnings as fixed if zero warnings reported
• Initialize Rails version with nil (Carsten Wirth)
• Fix output test when using newer Minitest