Fix dependencies for awssum-amazon-* packages

Since AwsSum has a plugin architecture, each plugin depends on awssum
itself. Using the new peerDependencies each package pulls in awssum
alongside itself. Also, each awssum-<provider>-<service> package also
pulls in the relevant awssum-<provider> package too.

Finally, using semver, it pays to depend on the v1.0.x patch series,
rather than sticking with a fixed version number.
Merge pull request #5 from chilts/fix-package-dependencies-for-awssum

Fix dependencies for awssum-amazon-* packages