Release 2.0.0-alpha.2

• feat(bind): rejects the promise if it fails (1d07e13)
• feat(bind): returns a promise (4c00b6e)
• feat(firestore option merging): (001ff40)
• refactor(lint): fix lint in tests (b5342a6)
• chore(example): add finished property on examples (6309e3c)
• fix(bind): check for where function when binding (6c6ebd6)
• docs(readme): update badges (0e926f6)