Fix comma in the PyInstaller spec

[skip test]

Author: mildbyte

splitgraph.spec

@@ -24,7 +24,8 @@ a = Analysis(
         "splitgraph.hooks.splitfile_commands",
         "splitgraph.ingestion.socrata.mount",
         "splitgraph.ingestion.socrata.querying",
-        "splitgraph.ingestion.dbt" "splitgraph.ingestion.snowflake",
+        "splitgraph.ingestion.dbt",
+        "splitgraph.ingestion.snowflake",
         # https://github.com/pypa/setuptools/issues/1963#issuecomment-574265532
         "pkg_resources.py2_warn",
         "target_postgres",