Release v8.4.0

v8.4.0 (2021-01-05)

Fix

• cancel timer and refresh alerts when env tab changes (#439)
• axios method type no longer string (#437)

Refactor

• alert detail navigation was confusing (#438)

Perf

• only keep alive 1 environment tab (#433)
• lazy load alert details and indicators components, again (#432)
• lazy load alert details and indicators components (#431)
• conditionally render environment tab contents (#430)