mark the MatrixReshaped type as deprecated

[stevengj]

This PR marks the MatrixReshaped type itself as deprecated, not just its constructor. That should prevent it from being displayed as the type name in Julia. (See this discourse post.)

For example:

julia> struct Bar{T}; x::T; end

julia> const Foo = Bar{Int}
Foo (alias for Bar{Int64})

julia> Foo(3) # displays alias Foo instead of Bar{Int}
Foo(3)

julia> Base.deprecate(Main, :Foo)

julia> Foo(3) # no longer displays the deprecated Foo type alias
Bar{Int64}(3)

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 85.99%. Comparing base (e1340f0) to head (3ffdf43).
Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1893   +/-   ##
=======================================
  Coverage   85.99%   85.99%           
=======================================
  Files         144      144           
  Lines        8666     8666           
=======================================
  Hits         7452     7452           
  Misses       1214     1214           

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