Update Swift 4.1 to latest released build, update Watson to 0.23.2 (i…

…bm-functions#26)

* Update Swift 4.1 to latest released build, update Watson to 0.23.2

* update changelog and checking in package.swift for a fixture

Remove swift4, refactor tests, sync with upstream openwhisk image (ib…

…m-functions#23)

* remove swift4, refactor tests, sync with upstream swift image

* remove Package.resolved

fix bug for calling a completion escaping (ibm-functions#22)

fix bug for calling a completion escaping (ibm-functions#22)

add escaping to return func (ibm-functions#21)

more flexible input output Codable (ibm-functions#20)

bum swift41 to build 03-07-a (ibm-functions#17)

Add Codable support (ibm-functions#13)

Add Codable support (ibm-functions#13)

Add Codable support (ibm-functions#13)