message: chore: update tree:
diff: "branch_attrs": {
  "labels": {
  "aa": "E: P71L; ORF1a: K1655N, K3353R; ORF3a: S171L; S: D80A, K417N, E484K, N501Y, A701V",
  - "clade": "20C.501.V2"
  + "clade": "20C/501Y.V2"
  },
  "mutations": {
  "E": [
  "value": "Giandhari J et al A"
  },
  "clade_membership": {
  - "value": "20C.501.V2"
  + "value": "20C/501Y.V2"
  },
  "country": {
  "value": "South Africa"
  "value": "Arash Iranzadeh et al"
  },
  "clade_membership": {
  - "value": "20C.501.V2"
  + "value": "20C/501Y.V2"
  },
  "country": {
  "value": "South Africa"
  "value": "Arash Iranzadeh et al"
  },
  "clade_membership": {
  - "value": "20C.501.V2"
  + "value": "20C/501Y.V2"
  },
  "country": {
  "value": "South Africa"
  "name": "NODE_0001126",
  "node_attrs": {
  "clade_membership": {
  - "value": "20C.501.V2"
  + "value": "20C/501Y.V2"
  },
  "div": 25,
  "legacy_clade_membership": {
  "name": "NODE_0001125",
  "node_attrs": {
  "clade_membership": {
  - "value": "20C.501.V2"
  + "value": "20C/501Y.V2"
  },
  "div": 18,
  "legacy_clade_membership": {
  "branch_attrs": {
  "labels": {
  "aa": "N: D3L, S235F; ORF1a: T1001I, A1708D, I2230T, S3675-, G3676-, F3677-; ORF8: Q27*, R52I, Y73C; S: I68X, H69-, V70X, V143X, Y144X, N501Y, A570D, T716I, S982A, D1118H, *1274X",
  - "clade": "B.1.1.7"
  + "clade": "20B/501Y.V1"
  },
  "mutations": {
  "N": [
  "value": "Rob Howes et al"
  },
  "clade_membership": {
  - "value": "B.1.1.7"
  + "value": "20B/501Y.V1"
  },
  "country": {
  "value": "United Kingdom"
  "value": "Rob Howes et al"
  },
  "clade_membership": {
  - "value": "B.1.1.7"
  + "value": "20B/501Y.V1"
  },
  "country": {
  "value": "United Kingdom"
  "name": "NODE_0000231",
  "node_attrs": {
  "clade_membership": {
  - "value": "B.1.1.7"
  + "value": "20B/501Y.V1"
  },
  "div": 28,
  "legacy_clade_membership": {
  