Cleanup milestone:

@BREAKING CHANGES!i

- Make symetric constructor for group & project milestone
- Merge `Milestone::create*` method by removing thei
  `project_id`/`group_id` parameter

Issue #23
11 jobs for !191 with master in 5 minutes and 52 seconds (queued for 4 seconds)
latest detached
Status Job ID Name Coverage
  Prepare
passed #4778439
linux docker ghostflow build
prepare:cargo-cache-newest

00:00:43

 
  Build
passed #4778440
linux docker ghostflow build
build:cargo-clippy

00:01:42

passed #4778441
linux docker ghostflow build
build:cargo-minimum

00:03:17

passed #4778444
linux docker ghostflow build
build:cargo-nightly

00:02:32

passed #4778442
linux docker ghostflow build
build:cargo-stable

00:03:12

passed #4778443
linux docker ghostflow build
build:cargo-tarpaulin

00:03:29

 
  Test
passed #4778445
linux docker ghostflow build
test:cargo-minimum

00:00:57

passed #4778448
linux docker ghostflow build
test:cargo-nightly

00:00:41

passed #4778446
linux docker ghostflow build
test:cargo-stable

00:00:57

passed #4778447
linux docker ghostflow privileged
test:cargo-tarpaulin

00:01:27

37.94%
 
  External
passed ghostflow-check-master