Add missing any to parameter in plugin.d.ts

[ChristianStornowski]

beforeResolve(result: any, callback: (err: Error | null, result) => void): void; afterResolve(result: any, callback: (err: Error | null, result) => void): void;

missing type any for result parameter for callback function. This results in errors when using "noImplicitAny": true for TypeScript compiler.