fix(plugin-jsx): make babel optional

Author: sxzz

packages/babel-plugin-jsx/package.json

@@ -46,5 +46,10 @@
   },
   "peerDependencies": {
     "@babel/core": "^7.0.0-0"
+  },
+  "peerDependenciesMeta": {
+    "@babel/core": {
+      "optional": true
+    }
   }
 }