README.md in sparql-3.2.5 vs README.md in sparql-3.2.6

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 # SPARQL Query and Update library for Ruby
 
 An implementation of [SPARQL][] for [RDF.rb][].
 
-[![Gem Version](https://badge.fury.io/rb/sparql.png)](https://badge.fury.io/rb/sparql)
+[![Gem Version](https://badge.fury.io/rb/sparql.svg)](https://badge.fury.io/rb/sparql)
 [![Build Status](https://github.com/ruby-rdf/sparql/workflows/CI/badge.svg?branch=develop)](https://github.com/ruby-rdf/sparql/actions?query=workflow%3ACI)
 [![Coverage Status](https://coveralls.io/repos/ruby-rdf/sparql/badge.svg?branch=develop)](https://coveralls.io/r/ruby-rdf/sparql?branch=develop)
 [![Gitter chat](https://badges.gitter.im/ruby-rdf/rdf.png)](https://gitter.im/ruby-rdf/rdf)
 
 ## Features