message: Update bentleyjs-tools version to use new docs script exclude option
diff: "publish:backend": "cd source/backend && npm publish",
  "publish:frontend": "cd source/frontend && npm publish",
  "predocs": "npm run extract",
  - "docs": "node node_modules/@bentley/bentleyjs-tools/scripts/docs.js --baseUrl=source/test/node_modules --includes=source/test/lib/extract --out=source/test/lib/docs --json=source/test/lib/docs/json/file.json",
  + "docs": "node node_modules/@bentley/bentleyjs-tools/scripts/docs.js --baseUrl=source/test/node_modules --includes=source/test/lib/extract --excludes=testbed,assets --out=source/test/lib/docs --json=source/test/lib/docs/json/file.json",
  "extract": "node node_modules/@bentley/bentleyjs-tools/scripts/extract.js --extractFrom=source/test --out=source/test/lib/extract",
  "test": "npm run test:backend && npm run test:frontend",
  "test:backend": "cd source/test && npm run test",
  "dependencies": {},
  "//devDependencies": "NOTE: These are the union of all devDependencies for source/frontend, source/backend, and source/test",
  "devDependencies": {
  - "@bentley/bentleyjs-tools": "^1.0.56",
  + "@bentley/bentleyjs-tools": "^1.0.58",
  "@types/chai": "^4.0.8",
  "@types/flatbuffers": "^1.6.5",
  "@types/fs-extra": "^4.0.5",
  