Adds :build_embedded and :start_permanent options

[sobolevn]

Changes:

1. Modified project/0 function
2. Bumped credo version, see Credo crashes with hex 0.14.0 due to using Hex.Utils.ensure_registry!/0 rrrene/credo#210

Closes #14

[coveralls]

Coverage remained the same at 90.909% when pulling 3710998 on sobolevn:master into a378782 on samueljseay:master.

[coveralls]

Coverage remained the same at 90.909% when pulling 3710998 on sobolevn:master into a378782 on samueljseay:master.

[sobolevn]

Hm, I guess some credo issues here.

[coveralls]

Coverage remained the same at 90.909% when pulling f65dc15 on sobolevn:master into a378782 on samueljseay:master.

[coveralls]

Coverage remained the same at 90.909% when pulling f65dc15 on sobolevn:master into a378782 on samueljseay:master.

[sobolevn]

New credo version is released: https://github.com/rrrene/credo/releases/tag/v0.6.0

So I will now bump it.

[coveralls]

Coverage remained the same at 90.476% when pulling 271c719 on sobolevn:master into 8c8de0e on samueljseay:master.

[samueljseay]

Thanks for your great work @sobolevn !