fix script

Author: guillermooo

bin/Publish.ps1

@@ -5,8 +5,6 @@
 
 param([string]$Tag)
 
-throw "not ready for use"
-
 function AbortIfProcessFailed {
     param([string]$message)
     if ($LASTEXITCODE) { throw $message }
@@ -24,6 +22,13 @@ function AbortIfGitNotAvailable {
     get-command git -erroraction stop > $null
 }
 
+function AbortIfNotOnMaster {
+    if (@(git branch | select-string "* master" -simplematch).Count -eq 0) {
+        throw "not on 'master' branch" 
+        exit 1
+    }
+}
+
 $toDelete = @(
     "manifest.json",
     "tests",