Set initial-branch (#427)

Signed-off-by: Josh Soref <jsoref@users.noreply.github.com>

dist/index.js

@@ -670,7 +670,11 @@ class GitCommandManager {
     }
     init() {
         return __awaiter(this, void 0, void 0, function* () {
-            yield this.execGit(['init', this.workingDirectory]);
+            yield this.execGit([
+                'init',
+                '--initial-branch=silence_warning_about_default_branch',
+                this.workingDirectory
+            ]);
         });
     }
     isDetached() {