Fixes: 385 - add package and code change related to graphql middleware

[himanshugoyal77]

Fixes #385

Added the "graphql-middleware": "^6.0.9", package in package.json

and changed
schema: applyMiddleware(makeExecutableSchema({ typeDefs, resolvers }), permissions),

to

    schema: applyMiddleware(
        makeExecutableSchema({ typeDefs, resolvers }),
        permissions.generate(makeExecutableSchema({ typeDefs, resolvers }))
    ),