Update .browserslistrc from upstream (#1231)

.browserslistrc

@@ -5,11 +5,7 @@ last 2 major versions
 not dead
 Chrome >= 60
 Firefox >= 60
-# needed since Legacy Edge still has usage; 79 was the first Chromium Edge version
-# should be removed in the future when its usage drops or when it's moved to dead browsers
-not Edge < 79
 Firefox ESR
-iOS >= 10
-Safari >= 10
-Android >= 6
+iOS >= 12
+Safari >= 12
 not Explorer <= 11