Bug fix: remove , in .zenodo.json

Removed the "," after the license:title metadata.  This was preventing
Zenodo from auto-generating a DOI from each Github release.

Signed-off-by: Bob Yantosca <yantosca@seas.harvard.edu>

.zenodo.json

@@ -37,7 +37,7 @@
     "license": {
         "id": "GPL-3.0",
         "url": "https://github.com/KineticPreProcessor/KPP/blob/main/LICENSE.txt",
-        "title": "GNU General Public License v3.0",
+        "title": "GNU General Public License v3.0"
     },
     "upload_type": "software"
 }