1.0.9

• Don't try to removeObserver if we are not yet observing.

1.0.8

• Swizzle dealloc method instead of using dealloc hooker.

1.0.7

• Now support iOS 6.

1.0.6

• Add textContainerInset as observing key.

1.0.5

• Fix an issue for multiline placeholder.

1.0.4

• Add support for multiline placeholder.

1.0.3

• Append bounds and frame to observingKeys.

1.0.2

• Use static for local variable in class method. (#1, @bcylin)

1.0.1

• Remove observers when dealloc.

1.0.0

Add podspec.