Add NEWS.md

Author: haampie

NEWS.md

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+# ArnoldiMethod.jl v0.4.0
+
+- BREAKING: The target structs `LM`, `SR`, `LR`, `SI`, `LI` are no longer exported. You have to
+  import them explicitly: `using ArnoldiMethod: LM`. But easier it to update your code from structs
+  `LM()` to symbols `:LM`.
+
+- ArnoldiMethod.jl now exports `partialschur!` and `ArnoldiWorkspace`, which can be used to
+  pre-allocate (custom) matrices. Also it can be used to run the algorithm from an existing partial
+  Schur decomposition.
+
+# ArnoldiMethod.jl v0.3.0
+
+- The required Julia version is now 1.6 or higher