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Add release note

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	`1`	+Add ``U``, ``V`` and ``C`` setter to ``Quiver``
	`2`	`+-----------------------------------------------`
	`3`	`+`
	`4`	+The ``U``, ``V`` and ``C`` values of the `~matplotlib.quiver.Quiver`
	`5`	`+can now be changed after the collection have been created.`
	`6`	`+`
	`7`	`+.. plot::`
	`8`	`+ :include-source: true`
	`9`	`+`
	`10`	`+ fig, ax = plt.subplots()`
	`11`	`+ X = np.arange(-10, 10, 1)`
	`12`	`+ Y = np.arange(-10, 10, 1)`
	`13`	`+ U, V = np.meshgrid(X, Y)`
	`14`	`+ M = np.hypot(U, V)`
	`15`	`+ qc = mquiver.Quiver(`
	`16`	`+ ax, X, Y, U, V, M`
	`17`	`+ )`
	`18`	`+`
	`19`	`+ qc.set_U(U/5)`
	`20`	`+`
	`21`	`+ ax.add_collection(qc)`
	`22`	`+ ax.autoscale_view()`

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