v0.10.3

New:

• Additional detection in findBreakingChanges() (#874)
• Experimental Schema Language now allows a leading pipe in union definitions (#907, #911)
• A printIntrospectionSchema() utility is now exported (#905)
• A getDirectiveValues() utility is now exported (a1f6308)

Fixed:

• Improvements to error messages
• Removes trailing commas from source so it can experimentally be used directly (86009a6)