fix(graphql): reinstall bootstrap as save-dev

https://github.com/martis-git/learn-frontend/issues/279

Author: azinit

examples/graphql/package.json

@@ -13,6 +13,7 @@
     "@types/react": "^16.9.0",
     "@types/react-dom": "^16.9.0",
     "antd": "^4.6.6",
+    "bootstrap": "^4.5.2",
     "classnames": "^2.2.6",
     "graphql": "^15.3.0",
     "graphql.macro": "^1.4.2",
@@ -58,7 +59,6 @@
     "@graphql-codegen/typescript-react-apollo": "^2.0.7",
     "@types/classnames": "^2.2.10",
     "@types/react-router": "^5.1.8",
-    "@types/react-router-dom": "^5.1.5",
-    "bootstrap": "^4.5.2"
+    "@types/react-router-dom": "^5.1.5"
   }
 }