fix cargo macros and improve check step trigger doc

Author: mschuchard

Cargo.toml

@@ -11,13 +11,10 @@ keywords = ["concourse", "concourseresource", "githubissues"]
 categories = ["api-bindings"]
 exclude = [".circleci", ".github", ".gitignore", "Dockerfile"]
 
-[dev-dependencies]
-tokio = { version = "1", features = ["macros"] }
-
 [dependencies]
 octocrab  = "0.49"
 concourse-resource = "0.3"
-tokio = { version = "1.0", features = ["rt-multi-thread"] }
+tokio = { version = "1.0", features = ["rt-multi-thread", "macros"] }
 serde = "1.0"
 serde_json = "1.0"
 log = "0.4"

README.md

@@ -47,7 +47,7 @@ version:
 
 ### `check`: returns size two list for closed Github issues and size one list for open Github issues
 
-The `check` step determines the state of the specified Github issue. If the state is `closed` (default behavior; otherwise `trigger` source parameter value) then the returned list of versions is size two. If the state is `open` (default behavior; otherwise NOT `trigger` source parameter value) then the returned list of versions is size one. This is specifically to trigger pipelines based on the issue state (`closed` triggers and `open` does not trigger by default; otherwise customized by `trigger` source parameter value) because it simulates a delta of versions for `closed` and not `open` (default). The actual returns are the following (note the states' serialization is implemented by Octocrab to be lowercase strings):
+The `check` step determines the state of the specified Github issue. If the state is equal to the `trigger` source parameter value (default: `closed`) then the returned list of versions is size two. If the state is not equal to the `trigger` source parameter value (default: `open`) then the returned list of versions is size one. This is specifically to trigger pipelines based on the issue state (`closed` triggers and `open` does not trigger by default; otherwise customized by `trigger` source parameter value) because it simulates a delta of versions for the `trigger` source parameter value. The actual returns are the following (note the states' serialization is implemented by Octocrab to be lowercase strings):
 
 trigger:
 ```json