v2.6.0

• #166: Fix dependencies as devDependencies
• #168: Removed note about aria-label requiring a or element
• #169: Update GitHubbers section of the readme
• #170: Add .ellipsis-expander to avoid targeting tag name (but still support the old selector for backward compatibility)
• #171: Apply :hover to :focus as well
• #172: Remove tab background-color for <button>s
• #173: Small typo