Support For Swift

[aggarwalpulkit596]

Support For Swift Added
#10

[aggarwalpulkit596]

@championswimmer cannot find image locally error in Travis.

[championswimmer]

the docker image is not built

 ---> Running in f5cd19d067c9
fetch http://dl-cdn.alpinelinux.org/alpine/v3.6/main/x86_64/APKINDEX.tar.gz
fetch http://dl-cdn.alpinelinux.org/alpine/v3.6/community/x86_64/APKINDEX.tar.gz
ERROR: unsatisfiable constraints:
  swift (missing):
    required by: world[swift=4.0]
The command '/bin/sh -c apk add --no-cache swift=4.0 bash' returned a non-zero code: 1

you need to fix the Dockerfile

[aggarwalpulkit596]

Okay will fix it

[aggarwalpulkit596]

@championswimmer bhaiya there is no support for alpine 3.6 for swift either we have to go with alpine 3.1 or above 4.0

[championswimmer]

make it based on this image then https://github.com/swiftdocker/docker-swift