fix(config-lerna-scopes): correct lerna in peerDependencies (#980)

Author: armano2

@commitlint/config-lerna-scopes/package.json

@@ -26,7 +26,7 @@
   },
   "homepage": "https://github.com/conventional-changelog/commitlint#readme",
   "peerDependencies": {
-    "lerna": "^3.20.2"
+    "lerna": "^2.0.0 || ^3.0.0"
   },
   "engines": {
     "node": ">=8"