Add option to fetch tags even if fetch-depth > 0 (#579)

* Add option to fetch tags even if fetch-depth > 0

* Add jest tests for fetchDepth and fetchTags options

README.md

@@ -87,6 +87,10 @@ When Git 2.18 or higher is not in your PATH, falls back to the REST API to downl
     # Default: 1
     fetch-depth: ''
 
+    # Whether to fetch tags, even if fetch-depth > 0.
+    # Default: false
+    fetch-tags: ''
+
     # Whether to download Git-LFS files
     # Default: false
     lfs: ''