v2.7.0

🎉 Features

• Add code cell folding #1458
  
• Hide autocomplete suggestions in run and runCell #1454
• Allow Hydrogen's autocompletions to be listed first #1455
• kernel-manager.js: clarify 'no kernel found' error description #1421

🐛 Bugs

• Run startup code on kernel restart, #1414
• Use monospace font in output area (fixes several formatting issues), #1424

👷 Internal Improvements

• Add a spec for ResultViewComponent #1440
• Cleanup flow defs, #1437
• Update prettier and remove travis prettifications, #1438
• Switch from greenkeeper to renovate, #1442
• Cleanup mobx usage, #1450
• Add new grammars to list of markupGrammars #1487
• Prompt for installed plugins in bug report template #1480

📝 Documentation

• Update altair example in docs #1481
• Update contributing guide #1423