fix broken TypeScript types

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Summary The TS compiler seems to ommit the types/ folder when build step is done leading to a broken import of the same when in use:

1 import { IBridgeConfig } from '../types';
                                ~~~~~~~~~~

node_modules/wbgl-bridge-sdk/build/main/bridge/WBGL.d.ts:1:31 - error TS2307: Cannot find module '../types' or its corresponding type declarations.

1 import { IBridgeConfig } from '../types';
                                ~~~~~~~~~~

naftalimurgor / wbgl-bridge-sdk

fix broken TypeScript types #12