mark the MatrixReshaped type as deprecated #1361

Job	Run time
Documentation	1m 52s
Julia 1.3 - ubuntu-latest - pull_request	21m 25s
Julia 1.3 - macos-latest - pull_request	23m 40s
Julia 1.3 - windows-latest - pull_request	30m 47s
Julia 1 - ubuntu-latest - pull_request	16m 19s
Julia 1 - macos-latest - pull_request	9m 36s
Julia 1 - windows-latest - pull_request	23m 31s
Julia pre - ubuntu-latest - pull_request	22m 7s
Julia pre - macos-latest - pull_request	14m 47s
Julia pre - windows-latest - pull_request	27m 5s
	3h 11m 9s

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