Fix branch name in update_version script (#8)

Author: rogebrd

scripts/update_version.sh

@@ -7,11 +7,11 @@ else
     set -ex
     NEW_VERSION=$1
 
-    git checkout master
+    git checkout main
     git reset --hard HEAD
 
     git tag "v${NEW_VERSION}" -m "${NEW_VERSION} release"
 
     git push origin
     git push origin --tags
-fi
+fi