Add bufferSize and includedRanges options to parse function in TS def (…

…#63)

* Fix the TypeScript definition of a Range

A Range contains:
- startIndex
- endIndex
- startPosition
- endPosition

* Add `bufferSize` and `includedRanges` to TS def

The function signature of `Parser.prototype.parse` defined in index.js
`Parser.prototype.parse = function(input, oldTree, {bufferSize,
includedRanges}={})` accepts a third optional parameter.
This commit reflects the signature in TypeScript definition.

tree-sitter.d.ts

@@ -1,6 +1,6 @@
 declare module "tree-sitter" {
   class Parser {
-    parse(input: string | Parser.Input, previousTree?: Parser.Tree): Parser.Tree;
+    parse(input: string | Parser.Input, previousTree?: Parser.Tree, options?: {bufferSize?: number, includedRanges?: Parser.Range[]}): Parser.Tree;
     getLanguage(): any;
     setLanguage(language: any): void;
     getLogger(): Parser.Logger;