docs(types): fix match option accept null/false

Fix #20

Add `null` and `false` possible values to `match` option, in order to prevent any `--match` flag or the `git-describe` command.

Correctly handled by JS code (see #20)

index.d.ts

@@ -17,7 +17,7 @@ export type GitDescribeOptions = {
   long?: boolean;
   longSemver?: boolean;
   requireAnnotated?: boolean;
-  match?: string;
+  match?: null | false | string;
   customArguments?: Array<string>;
 };