Added ability to specify resolve listeners for stream events

(before the events are emitted).

This commit introduces a backwards-incompatible change to the interface
of the resolveInput function, while bumping the package version from
2.0.0 to 2.0.1. Such a breaking change would normally warrant a major
version bump (from 2.0.0 to 3.0.0). However, this change can also be
described as bug fix to a 2.0.0 design flaw. We believe no one is using
2.0.0 yet and a patch change is an effective way of ensuring that the
2.x.x branch follows the new interface.

Change-type: patch
Signed-off-by: Paulo Castro <paulo@balena.io>

.gitignore

@@ -1,4 +1,5 @@
 node_modules
+.DS_Store
 .vscode
 # Ignore generated test files
 src/**/*.js