Peer dependency resolve issue on npm install

After cloning the project and run ```npm install```. This happened:

```
npm WARN ERESOLVE overriding peer dependency
npm WARN Found: class-transformer@0.4.0
npm WARN node_modules/class-transformer
npm WARN peerOptional class-transformer@"*" from @nestjs/common@7.6.13
npm WARN node_modules/@nestjs/common
npm WARN @nestjs/common@"^7.0.0" from the root project
npm WARN 5 more (@nestjs/core, @nestjs/graphql, ...)
npm WARN
npm WARN Could not resolve dependency:
npm WARN peer class-transformer@"^0.2.0 || ^0.3.0" from @nestjs/mapped-types@0.3.0
npm WARN node_modules/@nestjs/mapped-types
npm WARN @nestjs/mapped-types@"0.3.0" from @nestjs/graphql@7.9.10
npm WARN node_modules/@nestjs/graphql
npm ERR! code ERESOLVE
npm ERR! ERESOLVE unable to resolve dependency tree
npm ERR!
npm ERR! Found: graphql@15.5.0
npm ERR! node_modules/graphql
npm ERR! graphql@"^15.3.0" from the root project
npm ERR! peer graphql@"^14.1.1 || ^15.0.0" from @nestjs/graphql@7.9.10
npm ERR! node_modules/@nestjs/graphql
npm ERR! @nestjs/graphql@"^7.6.0" from the root project
npm ERR! 9 more (apollo-server-express, graphql-tools, @apollo/gateway, ...)
npm ERR!
npm ERR! Could not resolve dependency:
npm ERR! peer graphql@"^14.2.1" from apollo-graphql@0.4.5
npm ERR! node_modules/@apollo/gateway/node_modules/apollo-graphql
npm ERR! apollo-graphql@"^0.4.0" from @apollo/gateway@0.17.0
npm ERR! node_modules/@apollo/gateway
npm ERR! optional @apollo/gateway@"^0.17.0" from @nestjs/graphql@7.9.10
npm ERR! node_modules/@nestjs/graphql
npm ERR! @nestjs/graphql@"^7.6.0" from the root project
npm ERR!
npm ERR! Fix the upstream dependency conflict, or retry
npm ERR! this command with --force, or --legacy-peer-deps
npm ERR! to accept an incorrect (and potentially broken) dependency resolution.

```