Upgrade to 1.0, transition guide and breaking changes

decorateRequest has been REMOVED, and will generate an error when called. See proxyReqOptDecorator and proxyReqBodyDecorator.

Error: decorateRequest is REMOVED; use proxyReqOptDecorator and proxyReqBodyDecorator instead.  see README.md
   at resolveOptions (/usr/src/app/node_modules/express-http-proxy/lib/resolveOptions.js:21:11)
   at new Container (/usr/src/app/node_modules/express-http-proxy/lib/scopeContainer.js:27:14)
   at handleProxy (/usr/src/app/node_modules/express-http-proxy/index.js:39:21)
   at Layer.handle [as handle_request] (/usr/src/app/node_modules/express/lib/router/layer.js:95:5)
   at trim_prefix (/usr/src/app/node_modules/express/lib/router/index.js:312:13)
   at /usr/src/app/node_modules/express/lib/router/index.js:280:7
   at param (/usr/src/app/node_modules/express/lib/router/index.js:349:14)
   at param (/usr/src/app/node_modules/express/lib/router/index.js:365:14)
   at Function.process_params (/usr/src/app/node_modules/express/lib/router/index.js:410:3)
   at next (/usr/src/app/node_modules/express/lib/router/index.js:271:10)