Fix typo for Mermaid overrides

Author: textbook

bulrush/templates/mermaid.html

@@ -9,5 +9,5 @@
     },
   };
 
-  mermaid.initialize({ ...defaults, ...JSON.parse({{ MERMAID | tojson }}) });
+  mermaid.initialize({ ...defaults, ...{{ MERMAID | tojson }} });
 </script>

setup.py

@@ -30,5 +30,5 @@
     test_suite='tests',
     tests_require=['pelican'],
     url='https://github.com/textbook/bulrush',
-    version='0.6.2',
+    version='0.6.3',
 )