v0.6.0

Feature

• Add merge modifier (907b630)
• Add append modifier (d4e8be4)
• Add base64 modifier (acd9d77)

Fix

• Don't set any cache timeout (ebbb5a6)
• Report unexpected arguments for skip directive (f7ff720)
• Add item_modifier directive (5e034d5)
• Don't cache data url (c7517a8)

Documentation

• Udpate readme (a110a82)