Fix limit for PostGIS geometry column types

lib/rails_erd/domain/attribute.rb

@@ -125,6 +125,7 @@ def type_description
       # Returns any non-standard limit for this attribute. If a column has no
       # limit or uses a default database limit, this method returns +nil+.
       def limit
+        return if native_type == 'geometry'
         return column.limit.to_i if column.limit != native_type[:limit] and column.limit.respond_to?(:to_i)
         column.precision.to_i if column.precision != native_type[:precision] and column.precision.respond_to?(:to_i)
       end