Fix typescript support

[kayahr]

Description

A TypeScript definition is included in the source repository but it is not included in the published package (See #33). This pull request references the definition in the package.json so it is included in the package and it is no longer necessary to depend on the external @types/error-stack-parser package.

This PR also adds an export line into the definition so it is possible to import the library properly with ES6 syntax:

import * as ErrorStackParser from "error-stack-parser";

const frames = ErrorStackParser.parse(new Error("Message"));

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• node_modules/.bin/jscs -c .jscsrc error-stack-parser.js passes without errors
• npm test passes without errors
• I have read the contribution guidelines
• I have updated the documentation accordingly
• I have added tests to cover my changes

[eriwen]

Excellent, thanks!