@types/web3 is incompatible with web3's built-in types

Hey @krzkaczor

I'm having a compilation problem with this package. Here's tsc output:

```
node_modules/truffle-typings/index.d.ts:8:21 - error TS1340: Module 'web3' does not refer to a type, but is used as a type here. Did you mean 'typeof import('web3')'?

8 declare type Web3 = import("web3");
~~~~~~~~~~~~~~

Found 1 error.
```

I believe the problem is that this package is based in `@types/web3`, and not `web3`'s built-int `.d.ts` files. These typings are incompatible, and the built-in ones "win" over the other, leading to this error.

Do you know how can I fix it? Do you have plans to update this package?

Thanks!

Start by reproducing the reported tsc error and inspect node_modules/truffle-typings/index.d.ts, especially its web3 type declaration. Compare the package's dependency on @types/web3 with web3's built-in .d.ts files; done means the incompatible declarations no longer produce TS1340 during compilation.

Written by the indexing model from the issue text.