issue 15: fixed panResponder reference

[eaglejs]

Issue #15: This addresses an issue where if a developer is using TypeScript, the application will fail to build because panResponder is not defined. Adding it as a property to the class seems to solve this issue.

[eaglejs]

Sorry for the delay. So I tried to deploy it and I got this issue.

Failed building JavaScript bundle.
While trying to resolve module `react-native-circle-slider` from file `./screens/dashboard.screen.tsx`, the package `./node_modules/react-native-circle-slider/package.json` was successfully found. However, this package itself specifies a `main` module field that could not be resolved (`./node_modules/react-native-circle-slider/index.js`. Indeed, none of these files exist:

  * ./node_modules/react-native-circle-slider/index.js(.native|.android.expo.ts|.native.expo.ts|.expo.ts|.android.expo.tsx|.native.expo.tsx|.expo.tsx|.android.expo.js|.native.expo.js|.expo.js|.android.expo.jsx|.native.expo.jsx|.expo.jsx|.android.ts|.native.ts|.ts|.android.tsx|.native.tsx|.tsx|.android.js|.native.js|.js|.android.jsx|.native.jsx|.jsx|.android.json|.native.json|.json|.android.wasm|.native.wasm|.wasm)
  * ./node_modules/react-native-circle-slider/index.js/index(.native|.android.expo.ts|.native.expo.ts|.expo.ts|.android.expo.tsx|.native.expo.tsx|.expo.tsx|.android.expo.js|.native.expo.js|.expo.js|.android.expo.jsx|.native.expo.jsx|.expo.jsx|.android.ts|.native.ts|.ts|.android.tsx|.native.tsx|.tsx|.android.js|.native.js|.js|.android.jsx|.native.jsx|.jsx|.android.json|.native.json|.json|.android.wasm|.native.wasm|.wasm)

[raymondchooi]

Ah oops, thanks for checking, I've updated the main to use index.ts now