2.3.0

• feat: add srcset option parameter to buildSrcSet() method signature (#118)
• perf(srcset): memoize generated srcset width-pairs (#115)
• fix: throw error when certain srcset modifiers are passed zero (#114)
• feat: append variable qualities to dpr srcsets (#111)
• feat: add support for defining a custom srcset width array (#110)
• feat: add support for defining a custom srcset width tolerance (#109)
• feat: add support for defining a min and max srcset width (#108)