Use zero has reference for superscript and subscript.

Author: SergioEstevao

Aztec/Classes/Converters/StringAttributesToAttributes/Implementations/SubscriptStringAttributeConverter.swift

@@ -42,7 +42,7 @@ open class SubscriptStringAttributeConverter: StringAttributeConverter {
                 return false
         }
 
-        return baselineOffset.intValue <= -4;
+        return baselineOffset.intValue < 0;
     }
 }
 

Aztec/Classes/Converters/StringAttributesToAttributes/Implementations/SuperscriptStringAttributeConverter.swift

@@ -42,7 +42,7 @@ open class SuperscriptStringAttributeConverter: StringAttributeConverter {
                 return false
         }
 
-        return baselineOffset.intValue >= 4;
+        return baselineOffset.intValue > 0;
     }
 }