Add a period, because...

versions/3.0.1.md

@@ -118,7 +118,7 @@ For example, if a field has an array value, the JSON array representation will b
 }
 ```
 All field names in the specification are **case sensitive**.
-This includes all fields that are used as keys in a map, except where explicitly noted that keys are **case insensitive**
+This includes all fields that are used as keys in a map, except where explicitly noted that keys are **case insensitive**.
 
 The schema exposes two types of fields: Fixed fields, which have a declared name, and Patterned fields, which declare a regex pattern for the field name.