v0.0.9

Chore

• upgrade npm packages and flow type definitions (f63f45fbda322c4e710f33d455603ada14142171)

Fix

• move bluebird to dev dependencies (b3cf2adb338a023bee746212c0d723765f31b865)
• restore backward compatibility, allow to pass null as headers into extractToken (a81e826d9e60127f6ad677eee5db6327944df413)

Tests

• add test, followup @a81e826 (73a5838b7f7090189ac93d0fbe123dd93af76299)