There should be no hard dependencies on @types/*

[taxilian]

Issue Summary

Currently the package has @types/express and @types/qs as package depedencies; this causes things to break if the containing package uses a different version.

Steps to Reproduce

Install a different version of those packages and then install twilio. Watch typescript blow up.

9:37:21 PM - File change detected. Starting incremental compilation...
node_modules/twilio/node_modules/@types/express/index.d.ts(59,29): error TS2694: Namespace 'serveStatic' has no exported member 'RequestHandlerConstructor'.
node_modules/twilio/node_modules/@types/express/index.d.ts(98,108): error TS2694: Namespace '"/Users/richard/code/ham/hamstudy2/node_modules/@types/express-serve-static-core/index"' has no exported member 'Query'.
node_modules/twilio/node_modules/@types/express/index.d.ts(99,17): error TS2707: Generic type 'ErrorRequestHandler' requires between 0 and 3 type arguments.
node_modules/twilio/node_modules/@types/express/index.d.ts(108,96): error TS2694: Namespace '"/Users/richard/code/ham/hamstudy2/node_modules/@types/express-serve-static-core/index"' has no exported member 'Query'.
node_modules/twilio/node_modules/@types/express/index.d.ts(108,111): error TS2707: Generic type 'Request<P, ResBody, ReqBody>' requires between 0 and 3 type arguments.
node_modules/twilio/node_modules/@types/express/index.d.ts(109,103): error TS2694: Namespace '"/Users/richard/code/ham/hamstudy2/node_modules/@types/express-serve-static-core/index"' has no exported member 'Query'.
node_modules/twilio/node_modules/@types/express/index.d.ts(109,118): error TS2707: Generic type 'RequestHandler<P, ResBody, ReqBody>' requires between 0 and 3 type arguments.
9:38:04 PM - Found 7 errors. Watching for file changes.

Suggested fix

You should never have dependencies like that in a library package; instead make them devDependencies and add them as peerDependencies.

[goalia]

+1 after installed twilio in my NestJS application, I can't run it node_modules/twilio/node_modules/@types/express/index.d.ts:59:29 - error TS2694: Namespace 'serveStatic' has no exported member 'RequestHandlerConstructor'.