Support pre release

README.md

@@ -28,6 +28,11 @@ Fetches and creates versioned GitHub resources.
   will be detected and published. Note that releases must have semver compliant
   tags to be detected, even if they're drafts.
 
+* `pre_release`: *Optional. Default `false`.* When set to `true`, `put` produces
+  pre-release and `check` only detects prereleases. If `false`, only non-prerelease releases
+  will be detected and published. Note that releases must have semver compliant
+  tags to be detected.
+
 ### Example
 
 ``` yaml

check_command.go

@@ -35,6 +35,10 @@ func (c *CheckCommand) Run(request CheckRequest) ([]Version, error) {
 		if request.Source.Drafts != *release.Draft {
 			continue
 		}
+		if request.Source.PreRelease != *release.Prerelease {
+			continue
+		}
+
 		if release.TagName == nil {
 			continue
 		}
@@ -67,7 +71,7 @@ func (c *CheckCommand) Run(request CheckRequest) ([]Version, error) {
 
 	for _, release := range filteredReleases {
 		if !upToLatest {
-			if *release.Draft {
+			if *release.Draft || *release.Prerelease {
 				id := *release.ID
 				upToLatest = request.Version.ID == strconv.Itoa(id)
 			} else {

out_command.go

@@ -58,12 +58,14 @@ func (c *OutCommand) Run(sourceDir string, request OutRequest) (OutResponse, err
 	}
 
 	draft := request.Source.Drafts
+	prerelease := request.Source.PreRelease
 
 	release := &github.RepositoryRelease{
 		Name:            github.String(name),
 		TagName:         github.String(tag),
 		Body:            github.String(body),
 		Draft:           github.Bool(draft),
+		Prerelease:      github.Bool(prerelease),
 		TargetCommitish: github.String(targetCommitish),
 	}
 
@@ -89,6 +91,7 @@ func (c *OutCommand) Run(sourceDir string, request OutRequest) (OutResponse, err
 		existingRelease.Name = github.String(name)
 		existingRelease.TargetCommitish = github.String(targetCommitish)
 		existingRelease.Draft = github.Bool(draft)
+		existingRelease.Prerelease = github.Bool(prerelease)
 
 		if bodySpecified {
 			existingRelease.Body = github.String(body)

resources.go

@@ -8,6 +8,7 @@ type Source struct {
 	GitHubUploadsURL string `json:"github_uploads_url"`
 	AccessToken      string `json:"access_token"`
 	Drafts           bool   `json:"drafts"`
+	PreRelease       bool   `json:"pre_release"`
 }
 
 type CheckRequest struct {