Update S3/Azure TypeScript definition file

[jleider]

This updates the S3 and Azure properties to be optional in the typescript definition file for properties with default values.

[singhjusraj]

@rnicholus Any idea why Travis build is failing on this one?
Doesn't seem like anything in this PR would break the build.

[rnicholus]

looks like a temporary Travis issue, somehow the server port was already in use. Restarting the build fixed it.

[singhjusraj]

@rnicholus Just wanted to know out of 3 merging options, what is your preferred way of merging PR's?
I'll do the same for any future merges.

[rnicholus]

I'm a fan of squashing all commits into one with a single descriptive commit message.

Unfortunately I haven't fully automated releases yet or setup anyone other than myself to publish to npm, but I'd like to change that...

[singhjusraj]

@jleider thanks for your contribution.

[rnicholus]

probably need to cut a new release, push to npm, github releases, etc. @SinghSukhdeep are you interested in becoming more involved in this project? If so, I'd like to give you the power to do all of these things.

[singhjusraj]

I'll be happy to help as much as I can.
I've never done something like this before, so please let me know the exact steps to follow.

[rnicholus]

So as much as I'd like to release this, the build is failing due to something Travis-CI "engineers" broke on their end (which tends to happen far too often). So I'm going to have to hold off until both this is fixed and I get another block of time to release a new version. Sorry.

[rnicholus]

honestly don't know when i'll be able to come back to this, so i was able to work around Travis' latest bug, and released 5.14.3.