Add changelog.

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+Fixed: PreconditionChebyshev would previously run one iteration more than
+requested, i.e., perform `degree+1` matrix-vector products rather than
+`degree` which is the convention in literature. This is now fixed. Note that
+the quality of PreconditionChebyshev is obviously slightly reduced by this
+change, and some solvers might need more outer iterations due to a ligher
+Chebyshev iteration.
+<br>
+(Martin Kronbichler, 2019/02/08)