Bump version.

Author: shinaoka

Project.toml

@@ -1,7 +1,7 @@
 name = "SparseIR"
 uuid = "4fe2279e-80f0-4adb-8463-ee114ff56b7d"
 authors = ["Samuel Badr <samuel.badr@gmail.com>", "Hiroshi Shinaoka <h.shinaoka@gmail.com>", "Markus Wallerberger <markus.wallerberger@tuwien.ac.at>"]
-version = "0.18.0"
+version = "0.19.0"
 
 [deps]
 QuadGK = "1fd47b50-473d-5c70-9696-f719f8f3bcdc"