v3.0.1

• Improved performance of selector matching on deeply nested elements and on stray end tags.
• Fixed element handlers never running for SVG and MathML integration-point elements when
  the preceding tag matched no selector.
• Fixed attribute selectors with an uppercase attribute name: [HREF] silently matched
  nothing and [HREF=x] was rejected as a namespaced selector.
• Fixed :nth-of-type() counting custom elements spelled with different ASCII case as
  distinct types.