v5.0.0 Alpha 4.0

Major version changes:

• AWSPayload is used for payloads in responses. PR #243
• Use property wrappers to define how collections are encoded/decoded. PR #215
• Added ability to stream request payloads. Added AWSPayload.stream which has a function that provides ByteBuffers to a request. Added AWSPayload.fileHandle which streams a file for a request.
• Added support for all AWS partitions. This gives access to china and government regions. PR #242
• Region is now a struct so we can add new regions without requiring a major version change. PR #246
• Change AWSClientError and AWSServerError to structs so they can be extended without a major version change. Removed some service specific errors from them. PR #247
• Renamed RetryController to RetryPolicy and defaulted it to JitterRetry which retries failed requests with a random wait time taken from an exponential increasing range.

Minor version changes:

• AWSClient.httpClient is now public
• Added TimeStampCoder property wrappers that enforces how a TimeStamp would be encoded/decoded. PR #249
• Added RED (Request, Error, Durarion) metrics using swift-metrics. PR #245

Patch version changes:

• Check for os Linux instead of availability of swift-crypto when chosing between which crypto to run.
• Don't set Content-Type header if it is already set
• Fixed issue with decoding empty XML arrays
• Add query encoding specialisation for EC2. EC2 requires all query variables to have their first character capitalised. PR #253
• Added iOS CI
• Replace using ProcessInfo to get environment variables with the C function getenv. PR #257