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iOS 10 By Tutorials - Typos

#1

As an initial point of topic, there seem to be a slew of typos inside the pre-release version of the book. One typo can be found within the code on page 181 Chapter 9: Property Animators.

Note the function for normalise(weight:) which should state normalize.
Same for the variable normalisedVelocity which should be normalizedVelocity.