fix(check-merge-safety): simplify check merge safety helper (#298)

* fix(check-merge-safety): simplify check

* improve tests

* update readme

* update docs

* fix code and tests

* fix tests

* clarify

* add another test for globs

* add success log

* improve error logging

* clean up

* add space

* simplify

* fix log

README.md

@@ -90,11 +90,11 @@ This workflow should be run on both `pull_request` and `push` events:
 
 The following parameters can be used for additional control over when it is safe to merge a PR:
 
-* `paths` defines file paths to all of a repo's co-dependent projects which could be affected by a PR
+* `paths`: These are the file paths to all of a repo's projects (usually paths to standalone packages)
   * This is useful for monorepos with multiple projects which are decoupled from each other but are affected by global dependencies.
-* `override_filter_paths` defines file paths that, if out of date on a PR, will prevent merge no matter what files the PR is changing
+* `override_filter_paths`: These are the file paths that, if out of date on a PR, will prevent merge no matter what files the PR is changing
     * example: `override_filter_paths: package.json,package-lock.json`
-* `override_filter_globs` defines glob patterns for `override_filter_paths`
+* `override_filter_globs`: These are glob patterns for `override_filter_paths`
 
 ### [create-pr](.github/workflows/create-pr.yml)
   * Opens a pull request