fix: migrate packages array properly (#597)

lib/config/migration.js

@@ -29,7 +29,9 @@ function migrateConfig(config) {
       migratedConfig.schedule = [val];
     } else if (key === 'packages') {
       isMigrated = true;
-      migratedConfig.packageRules = migrateConfig(val);
+      migratedConfig.packageRules = migratedConfig.packages.map(
+        p => migrateConfig(p).migratedConfig
+      );
       delete migratedConfig.packages;
     } else if (key === 'packageName') {
       isMigrated = true;

test/config/__snapshots__/migration.spec.js.snap

@@ -6,20 +6,17 @@ Object {
   "optionalDependencies": Object {
     "respectLatest": false,
   },
-  "packageRules": Object {
-    "isMigrated": true,
-    "migratedConfig": Object {
-      "0": Object {
-        "enabled": false,
-        "packageNames": Array [
-          "angular",
-        ],
-        "packagePatterns": Array [
-          "ang",
-        ],
-      },
+  "packageRules": Array [
+    Object {
+      "enabled": false,
+      "packageNames": Array [
+        "angular",
+      ],
+      "packagePatterns": Array [
+        "ang",
+      ],
     },
-  },
+  ],
   "schedule": Array [
     "after 5pm",
   ],