New version of docs

docs/upgrading.md

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+#Upgrading to from version -0.4.0
+
+Some of the interfaces has been upgraded.
+
+#Initialization
+
+mermaid_config is no longer used. Instead a call to mermaid initialize is done as in the example below:
+
+## version 0.4.0
+
+```
+mermaid_config = {
+    startOnLoad:true
+    };
+```
+
+## will look like below in version 0.5.0
+
+```
+mermaid.initialize({
+    startOnLoad:true
+    });
+```