Preventing SwiftyJSON compile fail with Swift 4.1

Merge pull request soto-project#69 from tengyifei/patch-1

Fix duplicate bucket name in URL normalization

Merge pull request soto-project#71 from noppoMan/update-package.resolved

update Package.resolved

Merge pull request soto-project#65 from noppoMan/update-models-171204

Update models 171204

Merge pull request soto-project#63 from noppoMan/improve-s3-test-cove…

…rage

Improve s3 test coverage

Merge pull request soto-project#62 from noppoMan/modules

Update module templates

Merge pull request soto-project#55 from noppoMan/change-license

change license from MIT to Apache-2.0

Merge pull request soto-project#53 from noppoMan/timestamp

switch type that express timestamp from Double to TimeStamp

Merge pull request soto-project#51 from noppoMan/swift4-codable

Codable conformance

Merge pull request soto-project#50 from noppoMan/swift4

Swift4