Get log level correct

dist/index.html

@@ -101,7 +101,7 @@ Class08 <--> C2: Cool label
   </div>
   <script src="./mermaid.js"></script>
   <script>
-    mermaid.initialize({ theme: 'forest' });
+    mermaid.initialize({ theme: 'forest', logLevel: 3 });
   </script>
   <script>
     function testClick(nodeId) {

src/diagrams/classDiagram/classDb.js

@@ -38,7 +38,7 @@ export const getRelations = function () {
 }
 
 export const addRelation = function (relation) {
-  logger.warn('Adding relation: ' + JSON.stringify(relation))
+  logger.debug('Adding relation: ' + JSON.stringify(relation))
   addClass(relation.id1)
   addClass(relation.id2)
   relations.push(relation)

src/mermaidAPI.js

@@ -489,7 +489,7 @@ function render2 (id, text, cb, containerElement) {
       return render(id, text, cb, containerElement)
     }
   } catch (e) {
-    logger.warn(e)
+    logger.error(e)
   }
 }