Update 21K clade definition
The mutation 25584T only appears in a subset of 21K viruses. Including this in the clade definition was excluding this subset lacking 25584T. I've swapped this to 18163G which appears to be in all the outbreak viruses and is not seen elsewhere in the tree.
@@ -133,8 +133,9 @@ clade gene site alt
21J (Delta) nuc 19220 T
21J (Delta) nuc 27874 T
-21K (Omicron) nuc 25000 T
-21K (Omicron) nuc 25584 T
-21K (Omicron) nuc 27259 C
21K (Omicron) nuc 8393 A
21K (Omicron) nuc 13195 C
+21K (Omicron) nuc 18163 G
+21K (Omicron) nuc 25000 T
+21K (Omicron) nuc 27259 C
+
