add news item for propellor 2.13.0

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+propellor 2.13.0 released with [[!toggle text="these changes"]]
+[[!toggleable text="""
+   * RevertableProperty used to be assumed to contain info, but this is
+     now made explicit, with RevertableProperty HasInfo or
+     RevertableProperty NoInfo. (API change)
+     Transition guide:
+       - If you define a RevertableProperty, expect some type check
+         failures like: "Expecting one more argument to ‘RevertableProperty’".
+       - Change it to "RevertableProperty NoInfo"
+       - The compiler will then tell you if it needs "HasInfo" instead.
+       - If you have code that uses the RevertableProperty constructor
+         that fails to type check, use the more powerful <!> operator
+         instead to create the RevertableProperty.
+   * Various property combinators that combined a RevertableProperty
+     with a non-revertable property used to yield a RevertableProperty.
+     This was a bug, because the combined property could not be fully
+     reverted in many cases, and the result is now a non-revertable property.
+   * combineWith now takes an additional parameter to control how revert
+     actions are combined (API change).
+   * Added Propellor.Property.Concurrent for concurrent properties.
+   * Made the execProcess exported by propellor, and everything built on it,
+     avoid scrambled output when run concurrently.
+   * Propellor now depends on STM and text.
+   * The cabal file now builds propellor with -O. While -O0 makes ghc
+     take less memory while building propellor, it can lead to bad memory
+     usage at runtime due to eg, disabled stream fusion.
+   * Add File.isCopyOf. Thanks, Per Olofsson."""]]
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